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邊框

使用邊框工具程式快速設定元素的邊框和邊框半徑。非常適合用於影像、按鈕或任何其他元素。

在此頁面

邊框

使用邊框工具程式新增或移除元素的邊框。選擇所有邊框或一次選擇一個。

加法

新增邊框至自訂元素

html 
<span class="border"></span>
<span class="border-top"></span>
<span class="border-end"></span>
<span class="border-bottom"></span>
<span class="border-start"></span>

減法

或移除邊框

html 
<span class="border border-0"></span>
<span class="border border-top-0"></span>
<span class="border border-end-0"></span>
<span class="border border-bottom-0"></span>
<span class="border border-start-0"></span>

色彩

例如 .border-* 的邊框工具程式是由我們的原始 $theme-colors Sass 對應所產生，目前尚未支援色彩模式，但任何 .border-*-subtle 工具程式都支援。此問題將在 v6 中解決。

使用建構於我們的佈景主題色彩上的工具程式變更邊框顏色。

html 
<span class="border border-primary"></span>
<span class="border border-primary-subtle"></span>
<span class="border border-secondary"></span>
<span class="border border-secondary-subtle"></span>
<span class="border border-success"></span>
<span class="border border-success-subtle"></span>
<span class="border border-danger"></span>
<span class="border border-danger-subtle"></span>
<span class="border border-warning"></span>
<span class="border border-warning-subtle"></span>
<span class="border border-info"></span>
<span class="border border-info-subtle"></span>
<span class="border border-light"></span>
<span class="border border-light-subtle"></span>
<span class="border border-dark"></span>
<span class="border border-dark-subtle"></span>
<span class="border border-black"></span>
<span class="border border-white"></span>

或修改元件的預設 border-color

危險標題
變更邊框顏色和寬度
html 
<div class="mb-4">
  <label for="exampleFormControlInput1" class="form-label">Email address</label>
  <input type="email" class="form-control border-success" id="exampleFormControlInput1" placeholder="name@example.com">
</div>

<div class="h4 pb-2 mb-4 text-danger border-bottom border-danger">
  Dangerous heading
</div>

<div class="p-3 bg-info bg-opacity-10 border border-info border-start-0 rounded-end">
  Changing border color and width
</div>

不透明度

已在 v5.2.0 中新增

Bootstrap border-{color} 工具程式使用 CSS 變數以 Sass 產生。這允許即時變更顏色，而不需要編譯和動態 alpha 透明度變更。

運作方式

考慮我們的預設 .border-success 工具程式。

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

我們使用 --bs-success (值為 25, 135, 84) CSS 變數的 RGB 版本，並附加第二個 CSS 變數 --bs-border-opacity，用於 alpha 透明度 (預設值為 1，這要歸功於一個本機 CSS 變數)。這表示現在每當您使用 .border-success 時，您計算出的 color 值為 rgba(25, 135, 84, 1)。每個 .border-* 類別內的本機 CSS 變數可避免繼承問題，因此工具程式的巢狀實例不會自動修改 alpha 透明度。

範例

若要變更不透明度，請透過自訂樣式或內嵌樣式覆寫 --bs-border-opacity。

這是預設成功的邊框
這是 50% 不透明度成功的邊框
html 
<div class="border border-success p-2 mb-2">This is default success border</div>
<div class="border border-success p-2" style="--bs-border-opacity: .5;">This is 50% opacity success border</div>

或者，從任何 .border-opacity 工具程式中選擇

這是預設成功的邊框
這是 75% 不透明度成功的邊框
這是 50% 不透明度成功的邊框
這是 25% 不透明度成功的邊框
這是 10% 不透明度成功邊框
html 
<div class="border border-success p-2 mb-2">This is default success border</div>
<div class="border border-success p-2 mb-2 border-opacity-75">This is 75% opacity success border</div>
<div class="border border-success p-2 mb-2 border-opacity-50">This is 50% opacity success border</div>
<div class="border border-success p-2 mb-2 border-opacity-25">This is 25% opacity success border</div>
<div class="border border-success p-2 border-opacity-10">This is 10% opacity success border</div>

寬度

html 
<span class="border border-1"></span>
<span class="border border-2"></span>
<span class="border border-3"></span>
<span class="border border-4"></span>
<span class="border border-5"></span>

半徑

將類別新增至元素以輕鬆將其角落變圓。

Example rounded image - Bootstrap 框架75x75 Example top rounded image - Bootstrap 框架75x75 Example right rounded image - Bootstrap 框架75x75 Example bottom rounded image - Bootstrap 框架75x75 Example left rounded image - Bootstrap 框架75x75 Completely round image - Bootstrap 框架75x75 Rounded pill image - Bootstrap 框架150x75
html 
<img src="..." class="rounded" alt="...">
<img src="..." class="rounded-top" alt="...">
<img src="..." class="rounded-end" alt="...">
<img src="..." class="rounded-bottom" alt="...">
<img src="..." class="rounded-start" alt="...">
<img src="..." class="rounded-circle" alt="...">
<img src="..." class="rounded-pill" alt="...">

大小

使用縮放類別來取得較大或較小的圓角。大小範圍從 0 到 5，且可透過修改公用程式 API 來進行設定。

Example non-rounded image - Bootstrap 框架75x75 Example small rounded image - Bootstrap 框架75x75 Example default rounded image - Bootstrap 框架75x75 Example large rounded image - Bootstrap 框架75x75 Example larger rounded image - Bootstrap 框架75x75 Example extra large rounded image - Bootstrap 框架75x75
html 
<img src="..." class="rounded-0" alt="...">
<img src="..." class="rounded-1" alt="...">
<img src="..." class="rounded-2" alt="...">
<img src="..." class="rounded-3" alt="...">
<img src="..." class="rounded-4" alt="...">
<img src="..." class="rounded-5" alt="...">
Example small rounded image - Bootstrap 框架75x75 Example default left rounded image - Bootstrap 框架75x75 Example right completely round image - Bootstrap 框架75x75 Example left rounded pill image - Bootstrap 框架75x75 Example extra large bottom rounded image - Bootstrap 框架75x75
html 
<img src="..." class="rounded-bottom-1" alt="...">
<img src="..." class="rounded-start-2" alt="...">
<img src="..." class="rounded-end-circle" alt="...">
<img src="..." class="rounded-start-pill" alt="...">
<img src="..." class="rounded-5 rounded-top-0" alt="...">

CSS

變數

已在 v5.2.0 中新增
scss/_root.scss 
--#{$prefix}border-width: #{$border-width};
--#{$prefix}border-style: #{$border-style};
--#{$prefix}border-color: #{$border-color};
--#{$prefix}border-color-translucent: #{$border-color-translucent};

--#{$prefix}border-radius: #{$border-radius};
--#{$prefix}border-radius-sm: #{$border-radius-sm};
--#{$prefix}border-radius-lg: #{$border-radius-lg};
--#{$prefix}border-radius-xl: #{$border-radius-xl};
--#{$prefix}border-radius-xxl: #{$border-radius-xxl};
--#{$prefix}border-radius-2xl: var(--#{$prefix}border-radius-xxl); // Deprecated in v5.3.0 for consistency
--#{$prefix}border-radius-pill: #{$border-radius-pill};

Sass 變數

scss/_variables.scss 
$border-width:                1px;
$border-widths: (
  1: 1px,
  2: 2px,
  3: 3px,
  4: 4px,
  5: 5px
);
$border-style:                solid;
$border-color:                $gray-300;
$border-color-translucent:    rgba($black, .175);
scss/_variables.scss 
$border-radius:               .375rem;
$border-radius-sm:            .25rem;
$border-radius-lg:            .5rem;
$border-radius-xl:            1rem;
$border-radius-xxl:           2rem;
$border-radius-pill:          50rem;

在淺色和深色模式中設定 .border-*-subtle 公用程式中的 border-color 的變數

scss/_variables.scss 
$primary-border-subtle:   tint-color($primary, 60%);
$secondary-border-subtle: tint-color($secondary, 60%);
$success-border-subtle:   tint-color($success, 60%);
$info-border-subtle:      tint-color($info, 60%);
$warning-border-subtle:   tint-color($warning, 60%);
$danger-border-subtle:    tint-color($danger, 60%);
$light-border-subtle:     $gray-200;
$dark-border-subtle:      $gray-500;
scss/_variables-dark.scss 
$primary-border-subtle-dark:        shade-color($primary, 40%);
$secondary-border-subtle-dark:      shade-color($secondary, 40%);
$success-border-subtle-dark:        shade-color($success, 40%);
$info-border-subtle-dark:           shade-color($info, 40%);
$warning-border-subtle-dark:        shade-color($warning, 40%);
$danger-border-subtle-dark:         shade-color($danger, 40%);
$light-border-subtle-dark:          $gray-700;
$dark-border-subtle-dark:           $gray-800;

Sass 地圖

色彩模式自適應邊框色彩也可以作為 Sass 地圖使用

scss/_maps.scss 
$theme-colors-border-subtle: (
  "primary": $primary-border-subtle,
  "secondary": $secondary-border-subtle,
  "success": $success-border-subtle,
  "info": $info-border-subtle,
  "warning": $warning-border-subtle,
  "danger": $danger-border-subtle,
  "light": $light-border-subtle,
  "dark": $dark-border-subtle,
);
scss/_maps.scss 
$theme-colors-border-subtle-dark: (
  "primary": $primary-border-subtle-dark,
  "secondary": $secondary-border-subtle-dark,
  "success": $success-border-subtle-dark,
  "info": $info-border-subtle-dark,
  "warning": $warning-border-subtle-dark,
  "danger": $danger-border-subtle-dark,
  "light": $light-border-subtle-dark,
  "dark": $dark-border-subtle-dark,
);

Sass 混合

scss/mixins/_border-radius.scss 
@mixin border-radius($radius: $border-radius, $fallback-border-radius: false) {
  @if $enable-rounded {
    border-radius: valid-radius($radius);
  }
  @else if $fallback-border-radius != false {
    border-radius: $fallback-border-radius;
  }
}

@mixin border-top-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-top-left-radius: valid-radius($radius);
    border-top-right-radius: valid-radius($radius);
  }
}

@mixin border-end-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-top-right-radius: valid-radius($radius);
    border-bottom-right-radius: valid-radius($radius);
  }
}

@mixin border-bottom-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-bottom-right-radius: valid-radius($radius);
    border-bottom-left-radius: valid-radius($radius);
  }
}

@mixin border-start-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-top-left-radius: valid-radius($radius);
    border-bottom-left-radius: valid-radius($radius);
  }
}

@mixin border-top-start-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-top-left-radius: valid-radius($radius);
  }
}

@mixin border-top-end-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-top-right-radius: valid-radius($radius);
  }
}

@mixin border-bottom-end-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-bottom-right-radius: valid-radius($radius);
  }
}

@mixin border-bottom-start-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-bottom-left-radius: valid-radius($radius);
  }
}

Sass 公用程式 API

邊框公用程式在 scss/_utilities.scss 中的公用程式 API 中宣告。 瞭解如何使用公用程式 API。

scss/_utilities.scss 
"border": (
  property: border,
  values: (
    null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
    0: 0,
  )
),
"border-top": (
  property: border-top,
  values: (
    null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
    0: 0,
  )
),
"border-end": (
  property: border-right,
  class: border-end,
  values: (
    null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
    0: 0,
  )
),
"border-bottom": (
  property: border-bottom,
  values: (
    null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
    0: 0,
  )
),
"border-start": (
  property: border-left,
  class: border-start,
  values: (
    null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
    0: 0,
  )
),
"border-color": (
  property: border-color,
  class: border,
  local-vars: (
    "border-opacity": 1
  ),
  values: $utilities-border-colors
),
"subtle-border-color": (
  property: border-color,
  class: border,
  values: $utilities-border-subtle
),
"border-width": (
  property: border-width,
  class: border,
  values: $border-widths
),
"border-opacity": (
  css-var: true,
  class: border-opacity,
  values: (
    10: .1,
    25: .25,
    50: .5,
    75: .75,
    100: 1
  )
),
scss/_utilities.scss 
"rounded": (
  property: border-radius,
  class: rounded,
  values: (
    null: var(--#{$prefix}border-radius),
    0: 0,
    1: var(--#{$prefix}border-radius-sm),
    2: var(--#{$prefix}border-radius),
    3: var(--#{$prefix}border-radius-lg),
    4: var(--#{$prefix}border-radius-xl),
    5: var(--#{$prefix}border-radius-xxl),
    circle: 50%,
    pill: var(--#{$prefix}border-radius-pill)
  )
),
"rounded-top": (
  property: border-top-left-radius border-top-right-radius,
  class: rounded-top,
  values: (
    null: var(--#{$prefix}border-radius),
    0: 0,
    1: var(--#{$prefix}border-radius-sm),
    2: var(--#{$prefix}border-radius),
    3: var(--#{$prefix}border-radius-lg),
    4: var(--#{$prefix}border-radius-xl),
    5: var(--#{$prefix}border-radius-xxl),
    circle: 50%,
    pill: var(--#{$prefix}border-radius-pill)
  )
),
"rounded-end": (
  property: border-top-right-radius border-bottom-right-radius,
  class: rounded-end,
  values: (
    null: var(--#{$prefix}border-radius),
    0: 0,
    1: var(--#{$prefix}border-radius-sm),
    2: var(--#{$prefix}border-radius),
    3: var(--#{$prefix}border-radius-lg),
    4: var(--#{$prefix}border-radius-xl),
    5: var(--#{$prefix}border-radius-xxl),
    circle: 50%,
    pill: var(--#{$prefix}border-radius-pill)
  )
),
"rounded-bottom": (
  property: border-bottom-right-radius border-bottom-left-radius,
  class: rounded-bottom,
  values: (
    null: var(--#{$prefix}border-radius),
    0: 0,
    1: var(--#{$prefix}border-radius-sm),
    2: var(--#{$prefix}border-radius),
    3: var(--#{$prefix}border-radius-lg),
    4: var(--#{$prefix}border-radius-xl),
    5: var(--#{$prefix}border-radius-xxl),
    circle: 50%,
    pill: var(--#{$prefix}border-radius-pill)
  )
),
"rounded-start": (
  property: border-bottom-left-radius border-top-left-radius,
  class: rounded-start,
  values: (
    null: var(--#{$prefix}border-radius),
    0: 0,
    1: var(--#{$prefix}border-radius-sm),
    2: var(--#{$prefix}border-radius),
    3: var(--#{$prefix}border-radius-lg),
    4: var(--#{$prefix}border-radius-xl),
    5: var(--#{$prefix}border-radius-xxl),
    circle: 50%,
    pill: var(--#{$prefix}border-radius-pill)
  )
),