border-color: blue
<?xml version = "1.0"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns = "http://www.w3.org/1999/xhtml"> <head> <title>Borders</title> <style type = "text/css"> div{ text-align: center; margin-bottom: 1em; padding: .5em; border-width: thick; border-color: blue; border-style: groove; } </style> </head> <body> <div>this is a test. </div> </body> </html>