Layout

Box Sizing

Utilities for controlling how the browser should calculate an element's total size.

Quick reference

Class	Description
box-border	box-sizing: border-box
box-content	box-sizing: content-box

Basic usage

Including borders and padding

Use box-border to set an element’s box-sizing to border-box, telling the browser to include the element’s borders and padding when you give it a height or width.

This means a 128px × 128px element with a 2px border and 16px of padding on all sides will be rendered as 100px × 100px, with an internal content area of 92px × 92px.

Warp makes this the default for all elements in the preflight base styles.

128px

128px

<div class="box-border h-128 w-128 p-16 border-2 ...">
  <!-- ... -->
</div>

Excluding borders and padding

Use box-content to set an element’s box-sizing to content-box, telling the browser to add borders and padding on top of the element’s specified width or height.

This means a 128px × 128px element with a 2px border and 16px of padding on all sides will actually be rendered as 164px × 164px, with an internal content area of 128px × 128px.

128px

128px

<div class="box-content h-128 w-128 p-16 border-3 ...">
  <!-- ... -->
</div>

Applying conditionally

Breakpoints and media queries

You can also use variant modifiers to target media queries like responsive breakpoints, dark mode, prefers-reduced-motion, and more. For example, use md:box-content to apply the box-content utility at only medium screen sizes and above.

<div class="box-border md:box-content">
  <!-- ... -->
</div>