Better Way To Set Size Of Input Textbox Across Platforms?

Update is below code chunks. Original Question: I have an input field that is extending well beyond the rest of the page, but as the question alludes to, it appears fine in iOS3/4/

Solution 1:

When coming back to try a few other things, I notice that I was mistaken. The above comment was made using size=#%, but when you use width: #%; it eliminates the wide variance across platforms.