Latar
Nepikeun harti ngaliwatan background-colortur nambahkeun hiasan kalawan gradién.
Warna latar
Sarupa jeung kelas warna téks kontekstual, setel latar tukang unsur pikeun sagala kelas kontekstual. Utiliti latar henteu disetelcolor , janten dina sababaraha kasus anjeun hoyong nganggo .text-* utilitas warna .
<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>Gradién latar
Ku nambahkeun .bg-gradientkelas, gradién linier ditambahkeun salaku gambar latar tukang. Gradién ieu dimimitian ku bodas semi-transparan anu luntur ka handap.
Naha anjeun peryogi gradién dina CSS khusus anjeun? Ngan nambahan background-image: var(--bs-gradient);.
Opacity
Ditambahkeun dina v5.1.0Salaku tina v5.1.0, background-colorUtiliti dihasilkeun kalawan Sass ngagunakeun variabel CSS. Hal ieu ngamungkinkeun parobahan warna sacara real-time tanpa kompilasi sareng parobahan transparansi alfa dinamis.
Kumaha gawéna
Pertimbangkeun .bg-successutilitas standar kami.
.bg-success {
--bs-bg-opacity: 1;
background-color: rgba(var(--bs-success-rgb), var(--bs-bg-opacity)) !important;
}
Urang make versi RGB urang --bs-success(kalawan nilai 25, 135, 84) variabel CSS jeung napel variabel CSS kadua, --bs-bg-opacity, Pikeun transparansi alfa (kalawan nilai standar 1berkat variabel CSS lokal). Éta hartosna iraha waé anjeun nganggo ayeuna, nilai .bg-successdiitung anjeun nyaéta . Variabel CSS lokal di jero unggal kelas ngahindarkeun masalah warisan ku kituna instansi anu disarangkeun tina utilitas henteu otomatis ngagaduhan transparansi alfa anu dirobih.colorrgba(25, 135, 84, 1).bg-*
Contona
Pikeun ngarobah opacity éta, override --bs-bg-opacityvia gaya custom atanapi gaya inline.
<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>Atanapi, pilih salah sahiji .bg-opacityutilitas:
<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
Salian pungsionalitas Sass di handap ieu, pertimbangkeun maca ngeunaan sipat khusus CSS kami anu kalebet (alias variabel CSS) pikeun warna sareng seueur deui.
Variabel
Kaseueuran background-colorutilitas didamel ku warna téma kami, ditugaskeun deui tina variabel palet warna umum kami.
$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));
Warna grayscale oge sadia, tapi ngan sawaréh dipaké pikeun ngahasilkeun sagala utiliti.
$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;
Harita
Warna téma teras dilebetkeun kana peta Sass ku kituna urang tiasa ngurilingan aranjeunna pikeun ngahasilkeun utilitas, modifier komponén, sareng seueur deui.
$theme-colors: (
"primary": $primary,
"secondary": $secondary,
"success": $success,
"info": $info,
"warning": $warning,
"danger": $danger,
"light": $light,
"dark": $dark
);
Warna Grayscale ogé sayogi salaku peta Sass. Peta ieu henteu dianggo pikeun ngahasilkeun utilitas.
$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
);
Warna RGB dihasilkeun tina peta Sass anu misah:
$theme-colors-rgb: map-loop($theme-colors, to-rgb, "$value");
Sareng opacities warna latar ngawangun éta kalayan peta sorangan anu dikonsumsi ku API utilitas:
$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, "$key", "bg");
Campuran
Teu aya campuran anu dianggo pikeun ngahasilkeun utilitas latar urang , tapi urang gaduh sababaraha campuran tambahan pikeun kaayaan sanés dimana anjeun hoyong nyiptakeun gradién anjeun nyalira.
@mixin gradient-bg($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);
}
Utiliti API
Utiliti latar dinya dinyatakeun dina Utiliti API kami di scss/_utilities.scss. Diajar kumaha ngagunakeun Utiliti API.
"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
)
),