input:focus
<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"> <head> <title>CSS Example</title> <style rel="stylesheet" type="text/css"> input:focus { background-color: #33FFFF; } </style> </head> <body> <form name="frmLogin" action="login.asp" method="post"> User name <input type="text" name="txtUserName" /><br /> Last name <input type="password" name="pwdPassword" /><br /> <input type="submit" value="Login" /> </form> </body> </html>