box-sizing

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

Quick reference

Class	Styles
box-border	box-sizing: border-box;
box-content	box-sizing: content-box;

Source: https://tailwindcss.com/guide/box-sizing

Examples

Including borders and padding

Use the box-border utility to include borders and padding in the element's total size:

<div class="box-border size-32 border-4 p-4 ..."></div>

Excluding borders and padding

Use the box-content utility to exclude borders and padding from the element's total size:

<div class="box-content size-32 border-4 p-4 ..."></div>

Responsive design

Prefix a box-sizing utility with a breakpoint variant like md: to only apply the utility at medium screen sizes and above:

<div class="box-content md:box-border ...">Lorem ipsum dolor sit amet...</div>

Learn more about using variants in the variants documentation.