Make header full width on Wexley template?

I'm using the Wexley template and want to make the header also react to the browser size and go full-width.

I'm using a gallery page here as a homepage. The gallery itself seems to extend to the edge of the page, but the header (with a gallery carousel inside) doesn't seem to. See pic below -the grid of pictures is full width, but the carosel header doesn't go all the way.

Any help?

Try adding this to Design > Custom CSS

div#headerWrapper {
    position: absolute !important;
    top: 0;
    left: 0;
    right: 0;
    padding-top: 60px;
    padding-left: 60px;
    padding-right: 60px;
}
div#pageWrapper {
    margin-top: 115px;
}