[delicjous]

Try this:

.l-small #header .site-logo img {
	display: block;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
	background: url("images/misc/vb_logo_darkblue.png") no-repeat; /* new logo path */
	width: 180px; /* Width of new image */
	height: 50px; /* Height of new image */
	padding-left: 180px; /* Equal to width of new image */
}