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// 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. https://github.com/necolas/normalize.css
// Document
//
// Change from `box-sizing: content-box` so that `width` is not affected by `padding` or `border`.
*,
*::before,
*::after {
box-sizing: border-box;
}
// Root
//
// Ability to the value of the root font sizes, affecting the value of `rem`.
// null by default, thus nothing is generated.
:root {
font-size: $font-size-root;
}
// Body
//
// 1. Remove the margin in all browsers.
// 2. As a best practice, apply a default `background-color`.
// 3. Prevent adjustments of font size after orientation changes in iOS.
// 4. Change the default tap highlight to be completely transparent in iOS.
body {
margin: 0; // 1
font-family: $font-family-base;
@include font-size($font-size-base);
font-weight: $font-weight-base;
line-height: $line-height-base;
color: $body-color;
text-align: $body-text-align;
background-color: $body-bg; // 2
-webkit-text-size-adjust: 100%; // 3
-webkit-tap-highlight-color: rgba($black, 0); // 4
}
// Future-proof rule: in browsers that support :focus-visible, suppress the focus outline
// on elements that programmatically receive focus but wouldn't normally show a visible
// focus outline. In general, this would mean that the outline is only applied if the
// interaction that led to the element receiving programmatic focus was a keyboard interaction,
// or the browser has somehow determined that the user is primarily a keyboard user and/or
// wants focus outlines to always be presented.
// See https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-visible
// and https://developer.paciellogroup.com/blog/2018/03/focus-visible-and-backwards-compatibility/
[tabindex="-1"]:focus:not(:focus-visible) {
outline: 0 !important;
}
// Content grouping
//
// 1. Reset Firefox's gray color
// 2. Set correct height and prevent the `size` attribute to make the `hr` look like an input field
// See https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_hr_size
hr {
margin: $hr-margin-y 0;
color: $hr-color; // 1
background-color: currentColor;
border: 0;
opacity: $hr-opacity;
}
hr:not([size]) {
height: $hr-height; // 2
}
// Typography
//
// 1. 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.
%heading {
margin-top: 0; // 1
margin-bottom: $headings-margin-bottom;
font-family: $headings-font-family;
font-style: $headings-font-style;
font-weight: $headings-font-weight;
line-height: $headings-line-height;
color: $headings-color;
}
h1 {
@extend %heading;
@include font-size($h1-font-size);
}
h2 {
@extend %heading;
@include font-size($h2-font-size);
}
h3 {
@extend %heading;
@include font-size($h3-font-size);
}
h4 {
@extend %heading;
@include font-size($h4-font-size);
}
h5 {
@extend %heading;
@include font-size($h5-font-size);
}
h6 {
@extend %heading;
@include font-size($h6-font-size);
}
// 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. Duplicate behavior to the data-* attribute for our tooltip plugin
// 2. Add the correct text decoration in Chrome, Edge, Opera, and Safari.
// 3. Add explicit cursor to indicate changed behavior.
// 4. Prevent the text-decoration to be skipped.
abbr[title],
abbr[data-original-title] { // 1
text-decoration: underline; // 2
text-decoration: underline dotted; // 2
cursor: help; // 3
text-decoration-skip-ink: none; // 4
}
// Address
address {
margin-bottom: 1rem;
font-style: normal;
line-height: inherit;
}
// Lists
ol,
ul {
padding-left: 2rem;
}
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;
}
// 1. Undo browser default
dd {
margin-bottom: .5rem;
margin-left: 0; // 1
}
// Blockquote
blockquote {
margin: 0 0 1rem;
}
// Strong
//
// Add the correct font weight in Chrome, Edge, and Safari
b,
strong {
font-weight: $font-weight-bolder;
}
// Small
//
// Add the correct font size in all browsers
small {
@include font-size($small-font-size);
}
// Mark
mark {
padding: $mark-padding;
background-color: $mark-bg;
}
// Sub and Sup
//
// Prevent `sub` and `sup` elements from affecting the line height in
// all browsers.
sub,
sup {
position: relative;
@include font-size($sub-sup-font-size);
line-height: 0;
vertical-align: baseline;
}
sub { bottom: -.25em; }
sup { top: -.5em; }
// Links
a {
color: $link-color;
text-decoration: $link-decoration;
&:hover {
color: $link-hover-color;
text-decoration: $link-hover-decoration;
}
}
// And undo these styles for placeholder links/named anchors (without href).
// It would be more straightforward to just use a[href] in previous block, but that
// causes specificity issues in many other styles that are too complex to fix.
// See https://github.com/twbs/bootstrap/issues/19402
a:not([href]) {
&,
&:hover {
color: inherit;
text-decoration: none;
}
}
// Code
pre,
code,
kbd,
samp {
font-family: $font-family-monospace;
@include font-size(1em); // Correct the odd `em` font sizing in all browsers.
}
// 1. Remove browser default top margin
// 2. Reset browser default of `1em` to use `rem`s
// 3. Don't allow content to break outside
pre {
display: block;
margin-top: 0; // 1
margin-bottom: 1rem; // 2
overflow: auto; // 3
@include font-size($code-font-size);
color: $pre-color;
// Account for some code outputs that place code tags in pre tags
code {
@include font-size(inherit);
color: inherit;
word-break: normal;
}
}
code {
@include font-size($code-font-size);
color: $code-color;
word-wrap: break-word;
// Streamline the style when inside anchors to avoid broken underline and more
a > & {
color: inherit;
}
}
kbd {
padding: $kbd-padding-y $kbd-padding-x;
@include font-size($kbd-font-size);
color: $kbd-color;
background-color: $kbd-bg;
@include border-radius($border-radius-sm);
kbd {
padding: 0;
@include font-size(1em);
font-weight: $nested-kbd-font-weight;
}
}
// Figures
//
// Apply a consistent margin strategy (matches our type styles).
figure {
margin: 0 0 1rem;
}
// Images and content
img,
svg {
vertical-align: middle;
}
// Tables
//
// Prevent double borders
table {
caption-side: bottom;
border-collapse: collapse;
}
caption {
padding-top: $table-cell-padding;
padding-bottom: $table-cell-padding;
color: $table-caption-color;
text-align: left;
}
// 1. Matches default `<td>` alignment by inheriting `text-align`.
// 2. Fix alignment for Safari
th {
text-align: inherit; // 1
text-align: -webkit-match-parent; // 2
}
// Forms
//
// 1. Allow labels to use `margin` for spacing.
label {
display: inline-block; // 1
margin-bottom: $label-margin-bottom;
}
// Remove the default `border-radius` that macOS Chrome adds.
// See https://github.com/twbs/bootstrap/issues/24093
button {
// stylelint-disable-next-line property-blacklist
border-radius: 0;
}
// Work around a Firefox bug where the transparent `button` background
// results in a loss of the default `button` focus styles.
// Credit https://github.com/suitcss/base/
button:focus {
outline: 1px dotted;
outline: 5px auto -webkit-focus-ring-color;
}
// 1. Remove the margin in Firefox and Safari
input,
button,
select,
optgroup,
textarea {
margin: 0; // 1
font-family: inherit;
@include font-size(inherit);
line-height: inherit;
}
// Show the overflow in Edge
button,
input {
overflow: visible;
}
// Remove the inheritance of text transform in Firefox
button,
select {
text-transform: none;
}
// Remove the inheritance of word-wrap in Safari.
// See https://github.com/twbs/bootstrap/issues/24990
select {
word-wrap: normal;
}
// Remove the dropdown arrow in Chrome from inputs built with datalists.
// See https://stackoverflow.com/a/54997118
[list]::-webkit-calendar-picker-indicator {
display: none;
}
// 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.
// 3. Opinionated: add "hand" cursor to non-disabled button elements.
button,
[type="button"], // 1
[type="reset"],
[type="submit"] {
-webkit-appearance: button; // 2
@if $enable-pointer-cursor-for-buttons {
&:not(:disabled) {
cursor: pointer; // 3
}
}
}
// Remove inner border and padding from Firefox, but don't restore the outline like Normalize.
::-moz-focus-inner {
padding: 0;
border-style: none;
}
// 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
input[type="date"],
input[type="time"],
input[type="datetime-local"],
input[type="month"] {
-webkit-appearance: textfield;
}
// 1. Textareas should really only resize vertically so they don't break their (horizontal) containers.
textarea {
resize: vertical; // 1
}
// 1. 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
// 2. Reset the default outline behavior of fieldsets so they don't affect page layout.
fieldset {
min-width: 0; // 1
padding: 0; // 2
margin: 0; // 2
border: 0; // 2
}
// 1. By using `float: left`, the legend will behave like a block element.
// This way the border of a fieldset wraps around the legend if present.
// 2. Correct the text wrapping in Edge.
// 3. Fix wrapping bug.
// See https://github.com/twbs/bootstrap/issues/29712
legend {
float: left; // 1
width: 100%;
padding: 0;
margin-bottom: $legend-margin-bottom;
@include font-size($legend-font-size);
font-weight: $legend-font-weight;
line-height: inherit;
white-space: normal; // 2
+ * {
clear: left; // 3
}
}
// Fix height of inputs with a type of datetime-local, date, month, week, or time
// See https://github.com/twbs/bootstrap/issues/18842
::-webkit-datetime-edit-fields-wrapper,
::-webkit-datetime-edit-text,
::-webkit-datetime-edit-minute,
::-webkit-datetime-edit-hour-field,
::-webkit-datetime-edit-day-field,
::-webkit-datetime-edit-month-field,
::-webkit-datetime-edit-year-field {
padding: 0;
}
::-webkit-inner-spin-button {
height: auto;
}
// 1. Correct the outline style in Safari.
// 2. 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.
[type="search"] {
outline-offset: -2px; // 1
-webkit-appearance: textfield; // 2
}
// Remove the inner padding in Chrome and Safari on macOS.
::-webkit-search-decoration {
-webkit-appearance: none;
}
// Remove padding around color pickers in webkit browsers
::-webkit-color-swatch-wrapper {
padding: 0;
}
// 1. Change font properties to `inherit` in Safari.
// 2. Correct the inability to style clickable types in iOS and Safari.
::-webkit-file-upload-button {
font: inherit; // 1
-webkit-appearance: button; // 2
}
// Correct element displays
output {
display: inline-block;
}
// Summary
//
// 1. Add the correct display in all browsers
summary {
display: list-item; // 1
cursor: pointer;
}
// Progress
//
// Add the correct vertical alignment in Chrome, Firefox, and Opera.
progress {
vertical-align: baseline;
}
// Hidden attribute
//
// Always hide an element with the `hidden` HTML attribute.
[hidden] {
display: none !important;
}
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