CSS on TD is not working. HTM:Struts2 theme = simple

[TPTP]

Why is my CSS not working? \[code\] <!--Struts2 log-in--> <form id="login" name="login" action="/springtest/login.action" method="POST"> <tr> <td> UserName:<input type="text" name="userName" maxlength="20" value="" id="login_userName"/> </td> <td class="errorMessage"> Username must not be blanks. </td> <br> </tr> <tr> <td> PassWord:<input type="password" name="password" maxlength="20" id="login_password"/> </td> <td class="errorMessage"> Password must not be blanks. <td> <br> </tr> <tr> <td> <input type="submit" id="login_0" value="http://stackoverflow.com/questions/13830796/Login"/> </td> </tr> </form>\[/code\]My CSS is for the class errorMessage is this. Any clues how to debug this? I tried firedebug but well I am just new about it... I also check this site for answers maybe there is an overlapped? but how can you know it?\[code\].errorMessage {color: red;font-size: 0.8em;} \[/code\]