CSS- need to change colours

If you look in your images folder, there should be an image that spans the whole width of your header.
That’s what is generating the background colour of your menu.

Using Chrome inspector, I was able to find this:

.header {
width: 100%;
float: left;
background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAACyCAMAAAAH3X16AAAAilBMV…EQBEEQBEEQ7AnzKML5gN3hvdKYy9cg2ATmKMKRVRhf9wJWZCf5RSdM5AAAAABJRU5ErkJggg==) repeat-x;
}