The CSS border-top-style, border-right-style, border-bottom-style and border-left-style properties are used to specify a border style for particular sides of an element. Alternately you can use the border-style property which is shorthand CSS for specifying all four border styles in one line.
none •• hidden •• dotted •• dashed •• solid
double •• groove •• ridge •• inset •• outset
border-style
border-color
border-width