Border

Notation

Border utility classes can be defined using the format -b{sides}[-{breakpoint}]--{size}.

{sides}

• t - use to apply border-top
• b - use to apply border-bottom
• l - use to apply border-left
• r - use to apply border-right
• x - use to apply border-left and border-right
• y - use to apply border-top and border-bottom
• blank - leave blank to apply border to all 4 sides.

{breakpoint}

Optionally include -{breakpoint} to apply the utility behaviour to some breakpoints. As a mobile first library, any applying to smaller breakpoint will modify also larger ones unless other class overrides this behaviour.

• blank - leave blank to apply border to all breakpoints.
• sm - use to apply border to sm and larger breakpoints.
• md - use to apply border to ms and larger breakpoints.
• lg - use to apply border to lg and larger breakpoints.
• xl - use to apply border to xl breakpoints.

{size}

• 0 - use to eliminate existing border and set to 0
• 1 - use to set border to 1px
• 2 - use to set border to 2px
• 3 - use to set border to 3px
• 4 - use to set border to 4px

Examples

Border Sides

Apply borders to specific sides of an element by adding t, b, l, r, x or y to the class name.

<div class="-bt--1"></div>
<div class="-br--1"></div>
<div class="-bb--1"></div>
<div class="-bl--1"></div>
<div class="-bx--1"></div>
<div class="-by--1"></div>

Breakpoints

Target specific breakpoints with responsive classes.

<div class="-bx--0 -by--4 -bx-lg--4 -by-lg--0"></div>
<div class="-b--0 -b-sm--1 -b-md--2 -b-lg--3 -b-xl--4"></div>

Border Sizes

Control an elements border size by adjusting the size from 0 - 4.

<div class="-b--0"></div>
<div class="-b--1"></div>
<div class="-b--2"></div>
<div class="-b--3"></div>
<div class="-b--4"></div>

Border Colors

Use contextual color classes to change a borders color.

Brand

Brand border colors reinforce CenturyLink's brand. Use primary and secondary as accents and base, dark, and light as neutrals.

<!-- For light backgrounds -->
<div class="-b--1"></div>
<div class="-b--1 -b--primary"></div>
<div class="-b--1 -b--dark"></div>
<!-- For dark backgrounds -->
<div class="-b--1 -b--secondary"></div>
<div class="-b--1 -b--light"></div>

Semantic

Use semantic border colors to communicate meaning to users. Use green (success) for positive, blue (info) for informative, red (danger) for negative, and yellow (warning) for needs attention.

<div class="-b--1 -b--success"></div>
<div class="-b--1 -b--info"></div>
<div class="-b--1 -b--danger"></div>
<div class="-b--1 -b--warning"></div>

Transparent

Use the transparent border color as a method to hide an elements border without altering its size.

<div class="-b--1 -b--transparent"></div>

Responsive

Use breakpoint classes to change an elements border color on different viewports. Follow the format -b[-{breakpoint}]--{color}.

<div class="-b--1 -b--primary -b-sm--dark -b-md--danger -b-lg--success -b-xl--warning"></div>