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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
Dangerous heading
Changing border color and width

Opacity #

Added in v1.0.1

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
Example rounded image 75x75 Example top rounded image 75x75 Example right rounded image 75x75 Example bottom rounded image 75x75 Example left rounded image 75x75 Completely round image 75x75 Rounded pill image 150x75

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
Example non-rounded image 75x75 Example small rounded image 75x75 Example default rounded image 75x75 Example large rounded image 75x75 Example larger rounded image 75x75 Example extra large rounded image 75x75

CSS #

Variables #

Added in v1.0.1 
--#{$prefix}border-width: #{$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 #

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))
    ),