PHP Programming

Hey how can change the font color of a form to red when the user does not meet the requirements?

For example:

Email: Joe123. // Error. didnt use @, change Email: to color: red.

Password: ****** // Error didnt filed password with at leat 5 characters change Password: to color: Red

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E-mail: Password:

File : form.php 1 'pass1 'testmail2' => 'pass2 $user=$_POST['email'); Spass=$_POST['pass']; if(array_key_exists($user, $logins)) // checking for user if ($logins [Suser] =- Spass) echo "You have successfully logged in!"; else echo"Sorry, wrong information has been entered!"; else echo" Sorry, wrong information has been entered!"; O localhost/loginform.html E-mail: testmail Password: passi Login o localhostform.php You have successfully logged in