exactly what i want

open wordpress editor and find out

#branding {
	z-index: 9999;
	background-color: #608eb5;
	padding-bottom: 20px;
	position: relative;
	background-repeat: repeat;
}

change background-color: #608eb5; to background-color: #608eb5 !important;

or you go to the header option and upload any image for header background (image size 1600 × 230 pixels }