Don’t worry I’ve found a workaround. I made my header images 1100 x 300 and then pasted .wp-custom-header img {
height: 200px;
width: 1100px;
margin: 0 auto;
display: block;
}
I think you have misunderstood my question. It is the image below the menu that is too deep. I want the image to be narrower but still fill the current width.