Borders

Use border utilities to quickly style the border and border-radius of an element. Great for images, buttons, or any other element.

Border #

Use border utilities to add or remove an element’s borders. Choose from all borders or one at a time.

Additive #

Add borders to custom elements:

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

RESULT

Subtractive #

Or remove borders:

<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>

RESULT

Color #

Change the border color using utilities built on our theme colors.

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

RESULT

Or modify the default border-color of a component:

<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>

RESULT

Email address

Dangerous heading

Changing border color and width

Opacity #

Added in v1.0.0

Sass creates UX4G border-{color} utilities using CSS variables. Real-time color adjustments without compilation and dynamic alpha transparency modifications are made possible by this.

How it works #

Consider our default .border-success utility.

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

Attached a second CSS variable, --bs-border-opacity, for the alpha transparency (with a default value of 1 thanks to a local CSS variable), and we utilize an RGB version of the --bs-success (with the value of 25, 135, 84) CSS variable. This implies each time developer use .border-success Currently, the value developer computed for color is rgba(25, 135, 84, 1). the internal local CSS variable of each. Because of the border-* class's ability to prevent inheritance problems, nested instances of the utility do not always have altered alpha transparency.

Example#

To change that opacity, override --bs-border-opacity via custom styles or inline styles.

<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>

RESULT

This is default success border

This is 50% opacity success border

Or, choose from any of the .border-opacity utilities:

<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>

RESULT

This is default success border

This is 75% opacity success border

This is 50% opacity success border

This is 25% opacity success border

This is 10% opacity success border

Width#

<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>

RESULT

Radius #

Add classes to an element to easily round its corners.

<img src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT9g0fRdKqqDBtVDkCbY1y6-f12akg1FWQfug&usqp=CAU" class="rounded" alt="...">
<img src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT9g0fRdKqqDBtVDkCbY1y6-f12akg1FWQfug&usqp=CAU" class="rounded-top" alt="...">
<img src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT9g0fRdKqqDBtVDkCbY1y6-f12akg1FWQfug&usqp=CAU" class="rounded-end" alt="...">
<img src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT9g0fRdKqqDBtVDkCbY1y6-f12akg1FWQfug&usqp=CAU" class="rounded-bottom" alt="...">
<img src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT9g0fRdKqqDBtVDkCbY1y6-f12akg1FWQfug&usqp=CAU" class="rounded-start" alt="...">
<img src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT9g0fRdKqqDBtVDkCbY1y6-f12akg1FWQfug&usqp=CAU" class="rounded-circle" alt="...">
<img src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT9g0fRdKqqDBtVDkCbY1y6-f12akg1FWQfug&usqp=CAU" class="rounded-pill" alt="...">

RESULT

Sizes #

Use the scaling classes for larger or smaller rounded corners. Sizes range from 0 to 5, and can be configured by modifying the utilities API.

<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="...">

RESULT

CSS #

Variables #

Added in v1.0.0

--#{$prefix}border-width: #{$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};
  --#{$prefix}border-radius-2xl: #{$border-radius-2xl};
  --#{$prefix}border-radius-pill: #{$border-radius-pill};

Sass variables #

$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);

$border-radius:               .375rem;
$border-radius-sm:            .25rem;
$border-radius-lg:            .5rem;
$border-radius-xl:            1rem;
$border-radius-2xl:           2rem;
$border-radius-pill:          50rem;

Sass mixins #


@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);
  }
}

Utilities API #

Border utilities are declared in our utilities API in scss/_utilities.scss. Learn how to use the utilities API.

"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
    ),
    "border-width": (
      css-var: true,
      css-variable-name: 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
      )
    ),

"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-2xl),
        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))
    ),
    "rounded-end": (
      property: border-top-right-radius border-bottom-right-radius,
      class: rounded-end,
      values: (null: var(--#{$prefix}border-radius))
    ),
    "rounded-bottom": (
      property: border-bottom-right-radius border-bottom-left-radius,
      class: rounded-bottom,
      values: (null: var(--#{$prefix}border-radius))
    ),
    "rounded-start": (
      property: border-bottom-left-radius border-top-left-radius,
      class: rounded-start,
      values: (null: var(--#{$prefix}border-radius))
    ),

Border
- Additive
- Subtractive
Color
Opacity
- How it works
- Example
Width
Radius
- Sizes
CSS

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