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Jan nou koumanse

Transmèt siyifikasyon atravè background-colorepi ajoute dekorasyon ak gradyan.

Koulè background

Menm jan ak klas koulè tèks kontèks yo, mete background nan yon eleman nan nenpòt klas kontèks. Sèvis piblik background pa metecolor , kidonk nan kèk ka ou pral vle sèvi ak .text-* sèvis piblik koulè .

.bg-prensipal
.bg-segondè
.bg-siksè
.bg-danje
.bg-avètisman
.bg-info
.bg-limyè
.bg-nwa
.bg-kò
.bg-blan
.bg-transparan
html
<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>

Jan nou koumanse gradyan

Lè w ajoute yon .bg-gradientklas, yo ajoute yon gradyan lineyè kòm imaj background nan orijin yo. Grayan sa a kòmanse ak yon blan semi-transparan ki disparèt nan pati anba a.

Ou bezwen yon gradyan nan CSS koutim ou a? Jis ajoute background-image: var(--bs-gradient);.

.bg-primary.bg-gradyan
.bg-segondè.bg-gradyan
.bg-siksè.bg-gradyan
.bg-danger.bg-gradyan
.bg-warning.bg-gradyan
.bg-info.bg-gradyan
.bg-light.bg-gradyan
.bg-nwa.bg-gradyan

Opakite

Te ajoute nan v5.1.0

Apati v5.1.0, background-colorsèvis piblik yo pwodwi ak Sass lè l sèvi avèk varyab CSS. Sa a pèmèt chanjman koulè an tan reyèl san yo pa konpilasyon ak chanjman dinamik transparans alfa.

Ki jan li fonksyone

Konsidere sèvis piblik default nou an .bg-success.

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

Nou itilize yon vèsyon RVB nan varyab CSS nou an --bs-success(avèk valè 25, 135, 84) epi nou tache yon dezyèm varyab CSS, --bs-bg-opacity, pou transparans alfa (ak yon valè default 1gras a yon varyab CSS lokal). Sa vle di nenpòt lè ou itilize kounye a, valè .bg-successkalkile ou se . Varyab lokal CSS andedan chak klas evite pwoblèm eritaj, kidonk ka enbrike nan sèvis piblik yo pa otomatikman gen yon transparans alfa modifye.colorrgba(25, 135, 84, 1).bg-*

Egzanp

Pou chanje opakite sa a, pase sou desizyon --bs-bg-opacityatravè estil koutim oswa estil inline.

Sa a se background siksè default
Sa a se 50% opasite siksè background
html
<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>

Oswa, chwazi nan nenpòt nan .bg-opacitysèvis piblik yo:

Sa a se background siksè default
Sa a se 75% opasite siksè background
Sa a se 50% opasite siksè background
Sa a se 25% opasite siksè background
Sa a se 10% opasite siksè background
html
<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

Anplis fonksyonalite Sass sa yo, konsidere li sou pwopriyete koutim CSS ki enkli nou yo (aka CSS varyab) pou koulè ak plis ankò.

Varyab

Pifò background-colorsèvis piblik yo te pwodwi pa koulè tèm nou yo, reasignate nan varyab palèt koulè jenerik nou an.

$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));

Koulè echèl gri yo disponib tou, men se sèlman yon subset yo itilize pou jenere nenpòt sèvis piblik.

$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;

Kat jeyografik

Lè sa a, koulè tèm yo mete nan yon kat Sass pou nou ka bouk sou yo pou jenere sèvis piblik nou yo, modifikatè eleman, ak plis ankò.

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

Koulè gri yo disponib tou kòm yon kat Sass. Kat sa a pa itilize pou jenere okenn sèvis piblik.

$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
);

Koulè RGB yo pwodwi nan yon kat Sass separe:

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

Ak opasite koulè background bati sou sa ak pwòp kat jeyografik yo ki boule pa sèvis piblik API a:

$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

Pa gen mixin yo itilize pou jenere sèvis piblik background nou yo , men nou gen kèk mixin adisyonèl pou lòt sitiyasyon kote ou ta renmen kreye pwòp gradyan ou.

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

  @if $enable-gradients {
    background-image: var(--#{$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);
}

Itilite API

Itilite background yo deklare nan API sèvis piblik nou an nan scss/_utilities.scss. Aprann kijan pou itilize API sèvis piblik yo.

    "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
      )
    ),