font-size: xx-small
<!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></title> <style type="text/css"> label { font-size: xx-small; } </style> </head> <body> <form method="post"> <label for="uname">Username</label> <input type="text" name="uname" id="uname" value="" /><br /> <label for="pword">Password</label> <input type="text" name="pword" id="pword" value="" /> <br /> <input type="submit" name="Submit" value="Submit" class="buttonSubmit" /> </form> </body> </html>