Spacing

A wide range of shorthand responsive margin, padding, and gap utility classes to modify an element’s appearance.

Margin and padding

Notation

Assign responsive-friendly margin or padding values to an element or a subset of its sides with shorthand classes. Includes support for individual properties, all properties, and vertical and horizontal properties. Classes are built from a default Sass map ranging from .25rem to 3rem.

The classes are named using the format {property}{sides}-{size} for xs and {property}{sides}-{breakpoint}-{size} for sm, md, lg, xl, and xxl.

Where property is one of:

• m - for classes that set margin
• p - for classes that set padding

Where sides is one of:

• t - for classes that set margin-top or padding-top
• b - for classes that set margin-bottom or padding-bottom
• s - (start) for classes that set margin-left or padding-left in LTR, margin-right or padding-right in RTL
• e - (end) for classes that set margin-right or padding-right in LTR, margin-left or padding-left in RTL
• x - for classes that set both *-left and *-right
• y - for classes that set both *-top and *-bottom
• blank - for classes that set a margin or padding on all 4 sides of the element

Where size is one of:

• 0 - for classes that eliminate the margin or padding by setting it to 0
• 1 - (by default) for classes that set the margin or padding to $spacer * .25
• 2 - (by default) for classes that set the margin or padding to $spacer * .5
• 3 - (by default) for classes that set the margin or padding to $spacer
• 4 - (by default) for classes that set the margin or padding to $spacer * 1.5
• 5 - (by default) for classes that set the margin or padding to $spacer * 3
• auto - for classes that set the margin to auto

Examples

          
  .mt-0 {
    margin-top: 0 !important;
  }
  
  .ms-1 {
    margin-left: ($spacer * .25) !important;
  }
  
  .px-2 {
    padding-left: ($spacer * .5) !important;
    padding-right: ($spacer * .5) !important;
  }
  
  .p-3 {
    padding: $spacer !important;
  }
          
        

Horizontal centering

Also includes an .mx-auto class for horizontally centering fixed-width block level content—that is, content that has display: block and a width set—by setting the horizontal margins to auto.

          
  <div class="mx-auto" style="width: 200px;">
    Centered element
  </div>
  
          
        

Negative margin

The syntax is nearly the same as the default, positive margin utilities, but with the addition of n before the requested size. Here’s an example class that’s the opposite of .mt-1:

          
  .mt-n1 {
    margin-top: -0.25rem !important;
  }
          
        

Gap

When using display: grid, you can make use of gap utilities on the parent grid container. This can save on having to add margin utilities to individual grid items (children of a display: grid container).

          
<div class="d-grid gap-3">
  <div class="p-2 bg-light border">Grid item 1</div>
  <div class="p-2 bg-light border">Grid item 2</div>
  <div class="p-2 bg-light border">Grid item 3</div>
</div>