A dotted border

A dashed border

A solid border

A double border

A groove border

A ridge border

An inset border

An outset border

A transparent border

Can add also borders top bottom etc.. :

STYLE type="text/css"
.a diferent{
    border-style:solid;
    border-top-color:lime;
    border-bottom-color:red;
    border-left-color:yellow;
    border-right-color:green;
    border-width:20px;
    border-top-width:10px;
    border-left-width:10px;
       }
/style