nav{background:rgba(0,0,0,0);transition:background .5s}nav:hover{background:#ffffff}@media (max-width:980px){.et_non_fixed_nav.et_transparent_nav #main-header,.et_non_fixed_nav.et_transparent_nav #top-header,.et_fixed_nav #main-header,.et_fixed_nav #top-header{position:fixed}}