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Convey meaning through background-colorleh gradient hmanga decoration belh.

Background rawng a ni

Contextual text color class ang bawkin element pakhat background chu contextual class eng pawhah set rawh. Background utilities a set loh avangin a then phei chuan color.text-* color utilities hman i duh ang .

.bg-a hmasa ber a ni
.bg-secondary a ni
.bg-hlawhtlinna
.bg-hlauhawm a ni
.bg-vaukhânna
.bg-ah hian a awm
.bg-eng a ni
.bg-thim a ni
.bg-taksa a ni
.bg-a var a ni
.bg-a langtlang thei
<div class="p-3 mb-2 bg-primary text-white">.bg-primary</div>
<div class="p-3 mb-2 bg-secondary text-white">.bg-secondary</div>
<div class="p-3 mb-2 bg-success text-white">.bg-success</div>
<div class="p-3 mb-2 bg-danger text-white">.bg-danger</div>
<div class="p-3 mb-2 bg-warning text-dark">.bg-warning</div>
<div class="p-3 mb-2 bg-info text-dark">.bg-info</div>
<div class="p-3 mb-2 bg-light text-dark">.bg-light</div>
<div class="p-3 mb-2 bg-dark text-white">.bg-dark</div>
<div class="p-3 mb-2 bg-body text-dark">.bg-body</div>
<div class="p-3 mb-2 bg-white text-dark">.bg-white</div>
<div class="p-3 mb-2 bg-transparent text-dark">.bg-transparent</div>

Background gradient a awm bawk

Class dah belh hian .bg-gradientlinear gradient chu background image atan backgrounds ah dah a ni. He gradient hi semi-transparent white atanga tan a ni a, a hnuai lam thlengin a fade chhuak thin.

I custom CSS ah hian gradient i mamawh em? Add mai rawh background-image: var(--bs-gradient);.

.bg-a hmasa ber.bg-gradient a ni
.bg-a pahnihna.bg-gradient a ni
.bg-hlawhtlinna.bg-gradient a ni
.bg-hlauhawm.bg-gradient a ni
.bg-vaukhânna.bg-gradient a ni
.bg-info.bg-a chhuahna tur a ni
.bg-eng.bg-gradient tih a ni
.bg-thim.bg-gradient tih a ni

Opacity a ni

v5.1.0 ah dah belh a ni

v5.1.0 atang khan background-colorSass hmangin CSS variable hmangin utilities siam a ni. Hei hian compilation leh dynamic alpha transparency thlak ngai lovin real-time color thlak theihna a siamsak a ni.

A hnathawh dan

Kan default .bg-successutility hi han ngaihtuah teh.

.bg-success {
  --bs-bg-opacity: 1;
  background-color: rgba(var(--bs-success-rgb), var(--bs-bg-opacity)) !important;
}

Kan --bs-success(value 25, 135, 84) CSS variable RGB version kan hmang a, alpha transparency atan CSS variable pahnihna, , kan attached a ( local CSS variable vangin --bs-bg-opacitydefault value nen ). 1Chumi awmzia chu .bg-successtuna i hman apiangin i computed colorvalue chu rgba(25, 135, 84, 1). Class tin chhunga local CSS variable hian .bg-*inheritance issue a pumpelh avangin utilities te nested instance te hian automatic in modified alpha transparency an nei lo.

Entirna

Chu opacity chu thlak tur chuan --bs-bg-opacitycustom style emaw inline style emaw hmangin override la.

Hei hi default success background a ni
Hei hi 50% opacity hlawhtlinna background a ni
<div class="bg-success p-2 text-white">This is default success background</div>
<div class="bg-success p-2" style="--bs-bg-opacity: .5;">This is 50% opacity success background</div>

.bg-opacityA nih loh leh, utility zingah eng emaw zat thlang rawh :

Hei hi default success background a ni
Hei hi 75% opacity hlawhtlinna background a ni
Hei hi 50% opacity hlawhtlinna background a ni
Hei hi 25% opacity hlawhtlinna background a ni
Hei hi 10% opacity hlawhtlinna background a ni
<div class="bg-success p-2 text-white">This is default success background</div>
<div class="bg-success p-2 text-white bg-opacity-75">This is 75% opacity success background</div>
<div class="bg-success p-2 text-dark bg-opacity-50">This is 50% opacity success background</div>
<div class="bg-success p-2 text-dark bg-opacity-25">This is 25% opacity success background</div>
<div class="bg-success p-2 text-dark bg-opacity-10">This is 10% opacity success background</div>

Sass a ni

A hnuaia Sass functionality bakah hian kan included CSS custom properties (aka CSS variables) te chu color leh thil dang tam tak tan chhiar tum ang che.

Variables te pawh a awm

Utility tam zawk background-colorhi kan theme colors atanga siam a ni a, kan generic color palette variable atanga reassign a ni.

$blue:    #0d6efd;
$indigo:  #6610f2;
$purple:  #6f42c1;
$pink:    #d63384;
$red:     #dc3545;
$orange:  #fd7e14;
$yellow:  #ffc107;
$green:   #198754;
$teal:    #20c997;
$cyan:    #0dcaf0;
$primary:       $blue;
$secondary:     $gray-600;
$success:       $green;
$info:          $cyan;
$warning:       $yellow;
$danger:        $red;
$light:         $gray-100;
$dark:          $gray-900;
$gradient: linear-gradient(180deg, rgba($white, .15), rgba($white, 0));

Grayscale color pawh a awm a, mahse subset chauh hmangin utility eng pawh siam a ni.

$white:    #fff;
$gray-100: #f8f9fa;
$gray-200: #e9ecef;
$gray-300: #dee2e6;
$gray-400: #ced4da;
$gray-500: #adb5bd;
$gray-600: #6c757d;
$gray-700: #495057;
$gray-800: #343a40;
$gray-900: #212529;
$black:    #000;

Map a ni

Chumi hnuah chuan theme color te chu Sass map ah dah a ni a, chutiang chuan kan utilities, component modifier leh thil dang tam tak siam turin kan loop thei a ni.

$theme-colors: (
  "primary":    $primary,
  "secondary":  $secondary,
  "success":    $success,
  "info":       $info,
  "warning":    $warning,
  "danger":     $danger,
  "light":      $light,
  "dark":       $dark
);

Sass map angin grayscale color pawh a awm bawk. He map hi utility engmah siam nan hman a ni lo.

$grays: (
  "100": $gray-100,
  "200": $gray-200,
  "300": $gray-300,
  "400": $gray-400,
  "500": $gray-500,
  "600": $gray-600,
  "700": $gray-700,
  "800": $gray-800,
  "900": $gray-900
);

RGB color te hi Sass map hran atanga siam a ni:

$theme-colors-rgb: map-loop($theme-colors, to-rgb, "$value");

Tin, background color opacities te chuan chu chu anmahni map hmangin an siam a, chu chu utilities API-in a eiral vek a ni:

$utilities-bg: map-merge(
  $utilities-colors,
  (
    "black": to-rgb($black),
    "white": to-rgb($white),
    "body": to-rgb($body-bg)
  )
);
$utilities-bg-colors: map-loop($utilities-bg, rgba-css-var, "$key", "bg");

Mixins te a awm

No mixins are used to generate our background utilities , mahse, i duh ang gradient siam duhna hmun dang atan mixin additional thenkhat kan nei a.

@mixin gradient-bg($color: null) {
  background-color: $color;

  @if $enable-gradients {
    background-image: var(--#{$variable-prefix}gradient);
  }
}
// Horizontal gradient, from left to right
//
// Creates two color stops, start and end, by specifying a color and position for each color stop.
@mixin gradient-x($start-color: $gray-700, $end-color: $gray-800, $start-percent: 0%, $end-percent: 100%) {
  background-image: linear-gradient(to right, $start-color $start-percent, $end-color $end-percent);
}

// Vertical gradient, from top to bottom
//
// Creates two color stops, start and end, by specifying a color and position for each color stop.
@mixin gradient-y($start-color: $gray-700, $end-color: $gray-800, $start-percent: null, $end-percent: null) {
  background-image: linear-gradient(to bottom, $start-color $start-percent, $end-color $end-percent);
}

@mixin gradient-directional($start-color: $gray-700, $end-color: $gray-800, $deg: 45deg) {
  background-image: linear-gradient($deg, $start-color, $end-color);
}

@mixin gradient-x-three-colors($start-color: $blue, $mid-color: $purple, $color-stop: 50%, $end-color: $red) {
  background-image: linear-gradient(to right, $start-color, $mid-color $color-stop, $end-color);
}

@mixin gradient-y-three-colors($start-color: $blue, $mid-color: $purple, $color-stop: 50%, $end-color: $red) {
  background-image: linear-gradient($start-color, $mid-color $color-stop, $end-color);
}

@mixin gradient-radial($inner-color: $gray-700, $outer-color: $gray-800) {
  background-image: radial-gradient(circle, $inner-color, $outer-color);
}

@mixin gradient-striped($color: rgba($white, .15), $angle: 45deg) {
  background-image: linear-gradient($angle, $color 25%, transparent 25%, transparent 50%, $color 50%, $color 75%, transparent 75%, transparent);
}

Utilities API hmanga thil tih a ni

Background utilities hi kan utilities API ah hian scss/_utilities.scss. Utilities API hman dan zir rawh.

    "background-color": (
      property: background-color,
      class: bg,
      local-vars: (
        "bg-opacity": 1
      ),
      values: map-merge(
        $utilities-bg-colors,
        (
          "transparent": transparent
        )
      )
    ),
    "bg-opacity": (
      css-var: true,
      class: bg-opacity,
      values: (
        10: .1,
        25: .25,
        50: .5,
        75: .75,
        100: 1
      )
    ),