Add image url

Hi everyone,

I have trouble with something. I’m trying to add an image to the nav bar.

The website is naruto-naruto.com
I have this code in my css:
/* Header */
.header-image {
top:px;
left:0px
}

header hgroup, header nav {
padding: 0 40px;
padding: 0 2.857142857rem;
margin-top: 48px;
margin-top: 0%;
margin-bottom: 48px;
margin-bottom: 3.428571429rem;
box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
margin: 0 auto;
max-width: 100%;
max-width: 100%;
overflow: hidden;
background: # FFF url(“images/navbg.jpg”)

and through this code It is possible to change the nav color, but it doesnt react to the url.

does anyone has a suggestion