@media screen and (max-width: 640px)
{
    
    #divOldalHeader 
    {
        background-image: none;
    }
 
    #aHamburger div
    {
        background-color: rgb(204,51,51);
    }
    
    #aHeaderLogo
    {
        left: 10px;
        background-image: url('../images/logo_mobil.png');
    }
}