URL Boxes Bigger

Could some one tell me how I could make my URL Boxes have a bigger height. Thank you!
http://www.mylilurl.com/

 

Use the CSS height property?

Assign an ID if you're going to be styling just one input, like so:

<input id="input-url" type="text" />

input#input-url { height:30px; }

If it's going to be multiple that will have the same height

<input class="input-fields" type="text">

input.input-fields { height:30px; }

 

Set a CSS class for your input field :

 <input name="url" size="65" type="text" class="my_class">

Code (markup):

and in your CSS file (or in the head section), define it :

.my_class {
	height:100px;
	} 

Code (markup):

 

Where would I post that in here?

<form method="post" action="http://www.mylilurl.com/">
	  <p>Type in any URL to make it lil</p>

<input type="hidden" name="action" value="generate_url" />
	 <input type="text" name="url" size="65" />
	 <p>A custom tag here (optional)</p>



<input type="text" name="tag" size="65" />	
<div id="result"></div>	
<INPUT TYPE="IMAGE" SRC="images/shorten.jpg" ALT="Submit button">

Code (markup):