CSS · The box model

outline

A ring drawn outside the border that does not affect layout. Essential for focus styles.

Syntax
outline: 2px solid

Example

Try it

More in this group

aspect-ratio border border-radius box-shadow box-sizing height margin margin-block / margin-inline

Learn this in the course

Reference pages are the quick answer. The course explains the why, shows the full example and ends with a challenge.

Open the course