'border-bottom' Example
<html> <head> <style> .style1 { border:5px solid #cccccc; border-bottom:5px solid red; } .style2 { border:"none"; } </style> </head> <body> <div id="myL" style="width:230; height:100; background-color:beige" onmouseover="this.className='style1'" onmouseout="this.className='style2'">This is a div element. </div> </body> </html>