How to Extend Header Width?

Okay so my blog is running on Point theme. And I want to increase its header width. I have increased the main container width. Hence the header is looking a bit out of structure. My blog is at techabrel(dot)com.

I’ve tried this code,

#header{
width:100%;
}

and

#header{
width:1120px;
}

and this as well,

#header{
max-width:1120px;
}

And nothing seem to work. I’m stuck and I desperately need help.

Thanks in advance.