border-style: ridge
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <title></title> <style type='text/css'> div { padding: 10px; margin: 10px; border: thick black; } </style> </head> <body> <div style='border-style: ridge;'> border-style: ridge; </div> </body> </html>