Hello there,
I've been builidng a website for some time now (ignore the fact that's it's in hebrew), and I've followed all the conventions of the html5 and css (at least according to the validator). Furthermore, I've taken a ready template for my website exactly in order to prevent myself these kind of issues:
My website is not shown properly in some of the screen resolutions + in mobile browsers.

The website should be spread on all of the screen and it doesn't, the position of the "search" button (the orange one in the bottom of the homepage) is different in each resolution.
How can I fix it?

Here's the link: www.mypresent.co.il
Thanks in advance