Can't click my search box - Joomla! Forum - community, help and support

hi there,
i have search box on website can't click in search box:

http://new.latch-project.co.uk/

if change "margin-top: -75px"; -0 works in wrong place.

#search {
float: right;
width:320px;
margin-top: -75px;
margin-right: 64px;
height: 40px;
overflow: hidden;
text-align:right;
}

any ideas?
thanks,
jack