WordPress MU

All i want to do is change the height of the "Create Blog >>" button on the WP-Signup.php page. i'm betting its really easy but its beyond my very limited skills. How do i do it?

thanks.

Find #submit in wp-signup.php and add some padding or something.

can you be a bit more specific on what i need to do please?

can anyone give me a total idiots guide on what i need to do to do this?

Ope up wp-signup.php Find stuff that looks like CSS.
Specifically this:

#submit, #blog_title, #user_email {
width: 90%;
font-size: 24px;
}

Add a line to specify the height.

height: 50px;

Right under where it says WIDTH would be a good spot.

i thought that the example above from andrea_r ajusted the typein area for the blogs name not for the button?

this is the css from my signup.php

.mu_register { width: 90%; margin:0 auto; }
.mu_register form { margin-top: 2em; }
.mu_register .error { font-weight:700; padding:10px; color:#333333; background:#FFEBE8; border:1px solid #CC0000; }
.mu_register #submit,
.mu_register #blog_title,
.mu_register #user_email,
.mu_register #blogname,
.mu_register #user_name { width:50%; font-size: 18px; margin:5px 0; }
.mu_register .prefix_address,
.mu_register .suffix_address {font-size: 12px;display:inline; }
.mu_register label { font-weight:700; font-size:15px; display:block; margin:10px 0; }
.mu_register label.checkbox { display:inline; }
.mu_register .mu_alert { font-weight:700; padding:10px; color:#333333; background:#ffffe0; border:1px solid #e6db55; }

Ahh! i get it!! (Doh!!)
thank you andrea_r