Hi,
Please take a look at the code in my last post up in this thread. The percentage dictates the width of the fields.
textarea { width: 80%; font-size: 13px;}
input[type="text"] {width: 40%; font-size: 13px;}
input[type="email"] {width: 40%; font-size: 13px;}
So, if I wanted my email input field to be the same width as the rest of the fields, the 40% would need to change to 80%. You can "play" with it in your custom css, to see how it comes out.
I am not a programmer, sorry, I can't help more. Maybe someone else will chime in. :)
Good luck,
A.