CSS outline property
The outline property is a shorthand property and is used to set the following properties in order.
outline-widthoutline-style(required)outline-color
Example
.p1 {
outline: 5px solid red;
outline-offset: 1px;
border: 2px solid black;
}
.p2 {
outline: 5px double #32b853;
outline-offset: 2px;
border: 2px solid black;
}Click on the "Try it Now" button to see how it works.