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389 lines
10 KiB
389 lines
10 KiB
// scss-lint:disable QualifyingElement, DuplicateProperty
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// Reboot
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//
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// Global resets to common HTML elements and more for easier usage by Bootstrap.
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// Adds additional rules on top of Normalize.css, including several overrides.
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// Reset the box-sizing
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//
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// Change from `box-sizing: content-box` to `border-box` so that when you add
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// `padding` or `border`s to an element, the overall declared `width` does not
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// change. For example, `width: 100px;` will always be `100px` despite the
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// `border: 10px solid red;` and `padding: 20px;`.
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//
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// Heads up! This reset may cause conflicts with some third-party widgets. For
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// recommendations on resolving such conflicts, see
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// https://getbootstrap.com/getting-started/#third-box-sizing.
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//
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// Credit: https://css-tricks.com/inheriting-box-sizing-probably-slightly-better-best-practice/
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html {
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box-sizing: border-box;
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}
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*,
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*::before,
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*::after {
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box-sizing: inherit;
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}
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// Make viewport responsive
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//
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// @viewport is needed because IE 10+ doesn't honor <meta name="viewport"> in
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// some cases. See https://timkadlec.com/2012/10/ie10-snap-mode-and-responsive-design/.
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// Eventually @viewport will replace <meta name="viewport">.
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//
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// However, `device-width` is broken on IE 10 on Windows (Phone) 8,
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// (see https://timkadlec.com/2013/01/windows-phone-8-and-device-width/ and https://github.com/twbs/bootstrap/issues/10497)
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// and the fix for that involves a snippet of JavaScript to sniff the user agent
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// and apply some conditional CSS.
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//
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// See https://getbootstrap.com/getting-started/#support-ie10-width for the relevant hack.
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//
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// Wrap `@viewport` with `@at-root` for when folks do a nested import (e.g.,
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// `.class-name { @import "bootstrap"; }`).
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@at-root {
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@-ms-viewport { width: device-width; }
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}
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//
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// Reset HTML, body, and more
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//
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html {
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// We assume no initial pixel `font-size` for accessibility reasons. This
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// allows web visitors to customize their browser default font-size, making
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// your project more inclusive and accessible to everyone.
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// As a side-effect of setting the @viewport above,
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// IE11 & Edge make the scrollbar overlap the content and automatically hide itself when not in use.
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// Unfortunately, the auto-showing of the scrollbar is sometimes too sensitive,
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// thus making it hard to click on stuff near the right edge of the page.
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// So we add this style to force IE11 & Edge to use a "normal", non-overlapping, non-auto-hiding scrollbar.
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// See https://github.com/twbs/bootstrap/issues/18543
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// and https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7165383/
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-ms-overflow-style: scrollbar;
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// Changes the default tap highlight to be completely transparent in iOS.
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-webkit-tap-highlight-color: rgba(0,0,0,0);
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}
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body {
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font-family: $font-family-base;
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font-size: $font-size-base;
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font-weight: $font-weight-base;
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line-height: $line-height-base;
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// Go easy on the eyes and use something other than `#000` for text
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color: $body-color;
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// By default, `<body>` has no `background-color` so we set one as a best practice.
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background-color: $body-bg;
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}
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// Suppress the focus outline on elements that cannot be accessed via keyboard.
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// This prevents an unwanted focus outline from appearing around elements that
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// might still respond to pointer events.
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//
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// Credit: https://github.com/suitcss/base
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[tabindex="-1"]:focus {
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outline: none !important;
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}
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//
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// Typography
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//
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// Remove top margins from headings
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//
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// By default, `<h1>`-`<h6>` all receive top and bottom margins. We nuke the top
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// margin for easier control within type scales as it avoids margin collapsing.
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h1, h2, h3, h4, h5, h6 {
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margin-top: 0;
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margin-bottom: .5rem;
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}
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// Reset margins on paragraphs
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//
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// Similarly, the top margin on `<p>`s get reset. However, we also reset the
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// bottom margin to use `rem` units instead of `em`.
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p {
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margin-top: 0;
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margin-bottom: 1rem;
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}
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// Abbreviations
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abbr[title],
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// Add data-* attribute to help out our tooltip plugin, per https://github.com/twbs/bootstrap/issues/5257
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abbr[data-original-title] {
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cursor: help;
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}
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address {
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margin-bottom: 1rem;
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font-style: normal;
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line-height: inherit;
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}
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ol,
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ul,
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dl {
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margin-top: 0;
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margin-bottom: 1rem;
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}
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ol ol,
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ul ul,
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ol ul,
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ul ol {
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margin-bottom: 0;
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}
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dt {
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font-weight: $dt-font-weight;
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}
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dd {
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margin-bottom: .5rem;
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margin-left: 0; // Undo browser default
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}
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blockquote {
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margin: 0 0 1rem;
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}
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//
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// Links
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//
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a {
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color: $link-color;
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text-decoration: $link-decoration;
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@include hover-focus {
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color: $link-hover-color;
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text-decoration: $link-hover-decoration;
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}
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}
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// And undo these styles for placeholder links/named anchors (without href)
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// which have not been made explicitly keyboard-focusable (without tabindex).
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// It would be more straightforward to just use a[href] in previous block, but that
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// causes specificity issues in many other styles that are too complex to fix.
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// See https://github.com/twbs/bootstrap/issues/19402
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a:not([href]):not([tabindex]) {
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color: inherit;
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text-decoration: none;
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@include hover-focus {
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color: inherit;
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text-decoration: none;
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}
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&:focus {
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outline: 0;
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}
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}
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//
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// Code
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//
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pre {
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// Remove browser default top margin
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margin-top: 0;
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// Reset browser default of `1em` to use `rem`s
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margin-bottom: 1rem;
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// Normalize v4 removed this property, causing `<pre>` content to break out of wrapping code snippets
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overflow: auto;
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}
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//
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// Figures
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//
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figure {
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// Normalize adds `margin` to `figure`s as browsers apply it inconsistently.
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// We reset that to create a better flow in-page.
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margin: 0 0 1rem;
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}
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//
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// Images
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//
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img {
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// By default, `<img>`s are `inline-block`. This assumes that, and vertically
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// centers them. This won't apply should you reset them to `block` level.
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vertical-align: middle;
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// Note: `<img>`s are deliberately not made responsive by default.
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// For the rationale behind this, see the comments on the `.img-fluid` class.
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}
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// iOS "clickable elements" fix for role="button"
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//
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// Fixes "clickability" issue (and more generally, the firing of events such as focus as well)
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// for traditionally non-focusable elements with role="button"
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// see https://developer.mozilla.org/en-US/docs/Web/Events/click#Safari_Mobile
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[role="button"] {
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cursor: pointer;
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}
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// Avoid 300ms click delay on touch devices that support the `touch-action` CSS property.
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//
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// In particular, unlike most other browsers, IE11+Edge on Windows 10 on touch devices and IE Mobile 10-11
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// DON'T remove the click delay when `<meta name="viewport" content="width=device-width">` is present.
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// However, they DO support removing the click delay via `touch-action: manipulation`.
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// See:
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// * https://v4-alpha.getbootstrap.com/content/reboot/#click-delay-optimization-for-touch
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// * http://caniuse.com/#feat=css-touch-action
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// * https://patrickhlauke.github.io/touch/tests/results/#suppressing-300ms-delay
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a,
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area,
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button,
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[role="button"],
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input,
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label,
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select,
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summary,
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textarea {
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touch-action: manipulation;
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}
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//
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// Tables
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//
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table {
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// No longer part of Normalize since v4
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border-collapse: collapse;
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// Reset for nesting within parents with `background-color`.
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background-color: $table-bg;
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}
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caption {
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padding-top: $table-cell-padding;
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padding-bottom: $table-cell-padding;
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color: $text-muted;
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text-align: left;
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caption-side: bottom;
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}
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th {
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// Centered by default, but left-align-ed to match the `td`s below.
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text-align: left;
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}
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//
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// Forms
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//
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label {
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// Allow labels to use `margin` for spacing.
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display: inline-block;
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margin-bottom: .5rem;
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}
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// Work around a Firefox/IE bug where the transparent `button` background
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// results in a loss of the default `button` focus styles.
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//
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// Credit: https://github.com/suitcss/base/
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button:focus {
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outline: 1px dotted;
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outline: 5px auto -webkit-focus-ring-color;
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}
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input,
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button,
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select,
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textarea {
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// Normalize includes `font: inherit;`, so `font-family`. `font-size`, etc are
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// properly inherited. However, `line-height` isn't inherited there.
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line-height: inherit;
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}
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input[type="radio"],
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input[type="checkbox"] {
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// Apply a disabled cursor for radios and checkboxes.
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//
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// Note: Neither radios nor checkboxes can be readonly.
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&:disabled {
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cursor: $cursor-disabled;
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}
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}
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input[type="date"],
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input[type="time"],
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input[type="datetime-local"],
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input[type="month"] {
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// Remove the default appearance of temporal inputs to avoid a Mobile Safari
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// bug where setting a custom line-height prevents text from being vertically
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// centered within the input.
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// See https://bugs.webkit.org/show_bug.cgi?id=139848
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// and https://github.com/twbs/bootstrap/issues/11266
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-webkit-appearance: listbox;
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}
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textarea {
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// Textareas should really only resize vertically so they don't break their (horizontal) containers.
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resize: vertical;
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}
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fieldset {
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// Browsers set a default `min-width: min-content;` on fieldsets,
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// unlike e.g. `<div>`s, which have `min-width: 0;` by default.
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// So we reset that to ensure fieldsets behave more like a standard block element.
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// See https://github.com/twbs/bootstrap/issues/12359
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// and https://html.spec.whatwg.org/multipage/#the-fieldset-and-legend-elements
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min-width: 0;
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// Reset the default outline behavior of fieldsets so they don't affect page layout.
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padding: 0;
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margin: 0;
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border: 0;
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}
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legend {
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// Reset the entire legend element to match the `fieldset`
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display: block;
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width: 100%;
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padding: 0;
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margin-bottom: .5rem;
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font-size: 1.5rem;
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line-height: inherit;
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}
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input[type="search"] {
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// This overrides the extra rounded corners on search inputs in iOS so that our
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// `.form-control` class can properly style them. Note that this cannot simply
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// be added to `.form-control` as it's not specific enough. For details, see
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// https://github.com/twbs/bootstrap/issues/11586.
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-webkit-appearance: none;
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}
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// todo: needed?
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output {
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display: inline-block;
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// font-size: $font-size-base;
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// line-height: $line-height;
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// color: $input-color;
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}
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// Always hide an element with the `hidden` HTML attribute (from PureCSS).
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[hidden] {
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display: none !important;
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}
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