// stylelint-disable 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 // // 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; @if $enable-smooth-scroll { @media (prefers-reduced-motion: no-preference) { scroll-behavior: smooth; } }
}
// 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 developer.mozilla.org/en-US/docs/Web/CSS/:focus-visible // and 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
hr {
margin: $hr-margin-y 0; color: $hr-color; // 1 background-color: currentColor; border: 0; opacity: $hr-opacity;
}
hr:not() {
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-bs-* 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.
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 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
&, &:hover { color: inherit; text-decoration: none; }
}
// Code
pre, code, kbd, samp {
font-family: $font-family-code; @include font-size(1em); // Correct the odd `em` font sizing in all browsers. direction: ltr #{"/* rtl:ignore */"}; unicode-bidi: bidi-override;
}
// 1. Remove browser default top margin // 2. Reset browser default of `1em` to use `rem`s // 3. Don't allow content to break outside
pre {
display: block; margin-top: 0; // 1 margin-bottom: 1rem; // 2 overflow: auto; // 3 @include font-size($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-y; padding-bottom: $table-cell-padding-y; color: $table-caption-color; text-align: left;
}
// 1. Removes font-weight bold by inheriting // 2. Matches default `<td>` alignment by inheriting `text-align`. // 3. Fix alignment for Safari
th {
font-weight: $table-th-font-weight; // 1 text-align: inherit; // 2 text-align: -webkit-match-parent; // 3
}
thead, tbody, tfoot, tr, td, th {
border-color: inherit; border-style: solid; border-width: 0;
}
// Forms // // 1. Allow labels to use `margin` for spacing.
label {
display: inline-block; // 1
}
// Remove the default `border-radius` that macOS Chrome adds. // See github.com/twbs/bootstrap/issues/24093
button {
// stylelint-disable-next-line property-disallowed-list border-radius: 0;
}
// Work around a Firefox bug where the transparent `button` background // results in a loss of the default `button` focus styles. // Credit github.com/suitcss/base/
button:focus {
outline: dotted 1px; outline: -webkit-focus-ring-color auto 5px;
}
// 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;
}
// Remove the inheritance of text transform in Firefox
button, select {
text-transform: none;
}
// Set the cursor for non-`<button>` buttons // // Details at github.com/twbs/bootstrap/pull/30562
- role=“button”
-
{
cursor: pointer;
}
// Remove the inheritance of word-wrap in Safari. // See github.com/twbs/bootstrap/issues/24990
select {
word-wrap: normal;
}
// Remove the dropdown arrow in Chrome from inputs built with datalists. // See 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-button-pointers { &: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;
}
// 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 github.com/twbs/bootstrap/issues/12359 // and 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. Fix wrapping bug. // See 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; + * { clear: left; // 2 }
}
// Fix height of inputs with a type of datetime-local, date, month, week, or time // See 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 // github.com/twbs/bootstrap/issues/11586.
- type=“search”
-
{
outline-offset: -2px; // 1 -webkit-appearance: textfield; // 2
}
// 1. A few input types should stay LTR // See rtlstyling.com/posts/rtl-styling#form-inputs // 2. RTL only output // See rtlcss.com/learn/usage-guide/control-directives/#raw
/* rtl:raw: [type=“tel”], [type=“url”], [type=“email”],
- type=“number”
-
{
direction: ltr;
} */
// 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;
}
// Inherit font family and line height for file input buttons
// stylelint-disable-next-line selector-pseudo-element-no-unknown ::file-selector-button {
font: inherit;
}
// 1. Change font properties to `inherit` // 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;
}
// Remove border from iframe
iframe {
border: 0;
}
// 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;
}