// stylelint-disable at-rule-no-vendor-prefix, declaration-no-important, selector-no-qualifying-type, property-no-vendor-prefix
// Reboot // // Normalization of HTML elements, manually forked from Normalize.css to remove // styles targeting irrelevant browsers while applying new styles. // // Normalize is licensed MIT. github.com/necolas/normalize.css
// Document // // 1. Change from `box-sizing: content-box` so that `width` is not affected by `padding` or `border`. // 2. Change the default font family in all browsers. // 3. Correct the line height in all browsers. // 4. Prevent adjustments of font size after orientation changes in IE on Windows Phone and in iOS. // 5. Setting @viewport causes scrollbars to overlap content in IE11 and Edge, so // we force a non-overlapping, non-auto-hiding scrollbar to counteract. // 6. Change the default tap highlight to be completely transparent in iOS.
*, *::before, *::after {
box-sizing: border-box; // 1
}
html {
font-family: sans-serif; // 2 line-height: 1.15; // 3 -webkit-text-size-adjust: 100%; // 4 -ms-text-size-adjust: 100%; // 4 -ms-overflow-style: scrollbar; // 5 -webkit-tap-highlight-color: rgba(0, 0, 0, 0); // 6
}
// IE10+ doesn't honor `<meta name=“viewport”>` in some cases. @at-root {
@-ms-viewport { width: device-width; }
}
// stylelint-disable selector-list-comma-newline-after // Shim for “new” HTML5 structural elements to display correctly (IE10, older browsers) article, aside, dialog, figcaption, figure, footer, header, hgroup, main, nav, section {
display: block;
} // stylelint-enable selector-list-comma-newline-after
// Body // // 1. Remove the margin in all browsers. // 2. As a best practice, apply a default `background-color`. // 3. Set an explicit initial text-align value so that we can later use the // the `inherit` value on things like `<th>` elements.
body {
margin: 0; // 1 font-family: $font-family-base; font-size: $font-size-base; font-weight: $font-weight-base; line-height: $line-height-base; color: $body-color; text-align: left; // 3 background-color: $body-bg; // 2
}
// Suppress the focus outline on elements that cannot be accessed via keyboard. // This prevents an unwanted focus outline from appearing around elements that // might still respond to pointer events. // // Credit: github.com/suitcss/base [tabindex=“-1”]:focus {
outline: 0 !important;
}
// Content grouping // // 1. Add the correct box sizing in Firefox. // 2. Show the overflow in Edge and IE.
hr {
box-sizing: content-box; // 1 height: 0; // 1 overflow: visible; // 2
}
// // Typography //
// Remove top margins from headings // // By default, `<h1>`-`<h6>` all receive top and bottom margins. We nuke the top // margin for easier control within type scales as it avoids margin collapsing. // stylelint-disable selector-list-comma-newline-after h1, h2, h3, h4, h5, h6 {
margin-top: 0; margin-bottom: $headings-margin-bottom;
} // stylelint-enable selector-list-comma-newline-after
// Reset margins on paragraphs // // Similarly, the top margin on `<p>`s get reset. However, we also reset the // bottom margin to use `rem` units instead of `em`. p {
margin-top: 0; margin-bottom: $paragraph-margin-bottom;
}
// Abbreviations // // 1. Remove the bottom border in Firefox 39-. // 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari. // 3. Add explicit cursor to indicate changed behavior. // 4. Duplicate behavior to the data-* attribute for our tooltip plugin
text-decoration: underline; // 2 text-decoration: underline dotted; // 2 cursor: help; // 3 border-bottom: 0; // 1
}
address {
margin-bottom: 1rem; font-style: normal; line-height: inherit;
}
ol, ul, dl {
margin-top: 0; margin-bottom: 1rem;
}
ol ol, ul ul, ol ul, ul ol {
margin-bottom: 0;
}
dt {
font-weight: $dt-font-weight;
}
dd {
margin-bottom: .5rem; margin-left: 0; // Undo browser default
}
blockquote {
margin: 0 0 1rem;
}
dfn {
font-style: italic; // Add the correct font style in Android 4.3-
}
// stylelint-disable font-weight-notation b, strong {
font-weight: bolder; // Add the correct font weight in Chrome, Edge, and Safari
} // stylelint-enable font-weight-notation
small {
font-size: 80%; // Add the correct font size in all browsers
}
// // Prevent `sub` and `sup` elements from affecting the line height in // all browsers. //
sub, sup {
position: relative; font-size: 75%; line-height: 0; vertical-align: baseline;
}
sub { bottom: -.25em; } sup { top: -.5em; }
// // Links //
a {
color: $link-color; text-decoration: $link-decoration; background-color: transparent; // Remove the gray background on active links in IE 10. -webkit-text-decoration-skip: objects; // Remove gaps in links underline in iOS 8+ and Safari 8+. @include hover { color: $link-hover-color; text-decoration: $link-hover-decoration; }
}
// And undo these styles for placeholder links/named anchors (without href) // which have not been made explicitly keyboard-focusable (without tabindex). // It would be more straightforward to just use a in previous block, but that // causes specificity issues in many other styles that are too complex to fix. // See github.com/twbs/bootstrap/issues/19402
color: inherit; text-decoration: none; @include hover-focus { color: inherit; text-decoration: none; } &:focus { outline: 0; }
}
// // Code //
// stylelint-disable font-family-no-duplicate-names pre, code, kbd, samp {
font-family: monospace, monospace; // Correct the inheritance and scaling of font size in all browsers. font-size: 1em; // Correct the odd `em` font sizing in all browsers.
} // stylelint-enable font-family-no-duplicate-names
pre {
// Remove browser default top margin margin-top: 0; // Reset browser default of `1em` to use `rem`s margin-bottom: 1rem; // Don't allow content to break outside overflow: auto; // We have @viewport set which causes scrollbars to overlap content in IE11 and Edge, so // we force a non-overlapping, non-auto-hiding scrollbar to counteract. -ms-overflow-style: scrollbar;
}
// // Figures //
figure {
// Apply a consistent margin strategy (matches our type styles). margin: 0 0 1rem;
}
// // Images and content //
img {
vertical-align: middle; border-style: none; // Remove the border on images inside links in IE 10-.
}
svg:not(:root) {
overflow: hidden; // Hide the overflow in IE
}
// // Tables //
table {
border-collapse: collapse; // Prevent double borders
}
caption {
padding-top: $table-cell-padding; padding-bottom: $table-cell-padding; color: $text-muted; text-align: left; caption-side: bottom;
}
th {
// Matches default `<td>` alignment by inheriting from the `<body>`, or the // closest parent with a set `text-align`. text-align: inherit;
}
// // Forms //
label {
// Allow labels to use `margin` for spacing. display: inline-block; margin-bottom: .5rem;
}
// Remove the default `border-radius` that macOS Chrome adds. // // Details at github.com/twbs/bootstrap/issues/24093 button {
border-radius: 0;
}
// Work around a Firefox/IE bug where the transparent `button` background // results in a loss of the default `button` focus styles. // // Credit: github.com/suitcss/base/ button:focus {
outline: 1px dotted; outline: 5px auto -webkit-focus-ring-color;
}
input, button, select, optgroup, textarea {
margin: 0; // Remove the margin in Firefox and Safari font-family: inherit; font-size: inherit; line-height: inherit;
}
button, input {
overflow: visible; // Show the overflow in Edge
}
button, select {
text-transform: none; // Remove the inheritance of text transform in Firefox
}
// 1. Prevent a WebKit bug where (2) destroys native `audio` and `video` // controls in Android 4. // 2. Correct the inability to style clickable types in iOS and Safari. button, html [type=“button”], // 1 [type=“reset”],
- type=“submit”
-
{
-webkit-appearance: button; // 2
}
// Remove inner border and padding from Firefox, but don't restore the outline like Normalize. button::-moz-focus-inner, [type=“button”]::-moz-focus-inner, [type=“reset”]::-moz-focus-inner, [type=“submit”]::-moz-focus-inner {
padding: 0; border-style: none;
}
box-sizing: border-box; // 1. Add the correct box sizing in IE 10- padding: 0; // 2. Remove the padding in IE 10-
}
// Remove the default appearance of temporal inputs to avoid a Mobile Safari // bug where setting a custom line-height prevents text from being vertically // centered within the input. // See https://bugs.webkit.org/show_bug.cgi?id=139848 // and https://github.com/twbs/bootstrap/issues/11266 -webkit-appearance: listbox;
}
textarea {
overflow: auto; // Remove the default vertical scrollbar in IE. // Textareas should really only resize vertically so they don't break their (horizontal) containers. resize: vertical;
}
fieldset {
// Browsers set a default `min-width: min-content;` on fieldsets, // unlike e.g. `<div>`s, which have `min-width: 0;` by default. // So we reset that to ensure fieldsets behave more like a standard block element. // See https://github.com/twbs/bootstrap/issues/12359 // and https://html.spec.whatwg.org/multipage/#the-fieldset-and-legend-elements min-width: 0; // Reset the default outline behavior of fieldsets so they don't affect page layout. padding: 0; margin: 0; border: 0;
}
// 1. Correct the text wrapping in Edge and IE. // 2. Correct the color inheritance from `fieldset` elements in IE. legend {
display: block; width: 100%; max-width: 100%; // 1 padding: 0; margin-bottom: .5rem; font-size: 1.5rem; line-height: inherit; color: inherit; // 2 white-space: normal; // 1
}
progress {
vertical-align: baseline; // Add the correct vertical alignment in Chrome, Firefox, and Opera.
}
// Correct the cursor style of increment and decrement buttons in Chrome. [type=“number”]::-webkit-inner-spin-button, [type=“number”]::-webkit-outer-spin-button {
height: auto;
}
- type=“search”
-
{
// This overrides the extra rounded corners on search inputs in iOS so that our // `.form-control` class can properly style them. Note that this cannot simply // be added to `.form-control` as it's not specific enough. For details, see // https://github.com/twbs/bootstrap/issues/11586. outline-offset: -2px; // 2. Correct the outline style in Safari. -webkit-appearance: none;
}
// // Remove the inner padding and cancel buttons in Chrome and Safari on macOS. //
[type=“search”]::-webkit-search-cancel-button, [type=“search”]::-webkit-search-decoration {
-webkit-appearance: none;
}
// // 1. Correct the inability to style clickable types in iOS and Safari. // 2. Change font properties to `inherit` in Safari. //
::-webkit-file-upload-button {
font: inherit; // 2 -webkit-appearance: button; // 1
}
// // Correct element displays //
output {
display: inline-block;
}
summary {
display: list-item; // Add the correct display in all browsers cursor: pointer;
}
template {
display: none; // Add the correct display in IE
}
// Always hide an element with the `hidden` HTML attribute (from PureCSS). // Needed for proper display in IE 10-.
- hidden
-
{
display: none !important;
}