Utilities for controlling how the browser should calculate an element
Use the box-border utility 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 100px × 100px element with a 2px border and 4px of padding on all sides will be rendered as 100px × 100px, with an internal content area of 88px × 88px:
Tailwind makes this the default for all elements in our preflight base styles.
Use the box-content utility 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 100px × 100px element with a 2px border and 4px of padding on all sides will actually be rendered as 112px × 112px, with an internal content area of 100px × 100px: