Making the font from a form bigger
===

again me and my stupid problems.
Now I got the following page:

http://jsfiddle.net/g3VBT/

I want to make the "enter your U.R.L here" text the following properties:

**font-weight: 600;<br>
font-size: 1.5em;**

The problem is,if I edit the font-size,the whole box looks wrong.
Is there ani solution to this?<br>
Thanks!