We will learn about css border property with suitable example. The CSS border properties allow you to specify the style, width, and color of an element's border. I have borders on all sides. I have a red bottom border. CSS Border Style dotted - Defines a dotted border. dashed - Defines a dashed border. solid - Defines a solid border. double - Defines a double border. groove - Defines a 3D grooved border. ... ridge - Defines a 3D ridged border. ... inset - Defines a 3D inset border. ... outset - Defines a 3D outset border. There are three properties of a border you can change − The border-color specifies the color of a border. The border-style specifies whether a border should be solid, dashed line, double line, or one of the other possible values. The border-width specifies the width of a border.