I have a problem with background

I have a problem with the background, I put on a black background

body { background-image: url (podloga.jpg); background-color: # C8C8C8; background-position: center; background-size: cover; background-repeat: no-repeat; }

and this to me is the basis for all other sites, now that you do review sites to see what it looks like and I click on any cell in the navbar when the page refresuje behind the white how to remove it when I click it to me there is no other colors in the background only that my mat ... thanks in advance