The outline CSS shorthand property allows drawing a line around the element, outside the border. It is used to set all the properties of the outline in a single declaration. CSS outline properties can be categorized into 4 types, namely, Outline-style, Outline-color, Outline-width & Outline-offset. We will discuss all the types of outline properties sequentially through the examples.

Outline-style: It is used to set the appearance of the outline of an element ie., it tells us the style or type of outline. Any other outline property cannot be accessed without setting the outline-style.

Syntax:

outline-style: auto|none|dotted|dashed|solid|double|groove|ridge|inset|outset|initial|inherit;