.nav-mobile ul:before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: -1;
    display: block;
    background-color: rgba(255,255,255,0.10);
}
.nav > ul > li ul:before, .nav-mobile ul:before, .topbar-before, .content:before {
     background-color: rgba(254,254,254,0.8);
}