The CSS border properties allow you to specify the style, width, and color of an element's border.

Syntax:

p { border: bordersize borderstyle bordercolor }

The border-style property specifies what kind of border to display.

The following values are allowed:

• dotted - Defines a dotted border
• dashed - Defines a dashed border
• solid - Defines a solid border
• double - Defines a double border

and much more ...

p {
  border: 5px solid red;
}