Inline responsive form elements

[JohnH]

I have a text input element and a submit input element that I need to be inline and responsive. The problem is that I can't find a way to get the text input element to be fluid without screwing up the positioning of the button. Any help would be appreciated.Here is the html structure I'm using.\[code\]<div class="search-call-to-action"> <form action="#"> <input type="text" name="search" placeholder="Search charities by keyword or name..."> <input class="btn btn-primary btn-large" type="submit" name="submit" value="http://stackoverflow.com/questions/15750633/Search"> </form></div>\[/code\]Here is a screenshot of what I am trying to achieve. The text input needs to be fluid.http://i.imgur.com/Ivty5Qq.png