Transparent header on mobile not showing

Hi, Transparent header isn’t showing on mobile, I found this code on a previous post put it cuts into the type (revolving headlines).

@media only screen and (max-width: 767px) {
#top #wrap_all .av_header_transparency, .av_header_transparency #advanced_menu_toggle {
background: transparent!important;
position: absolute!important;
}}

Hope you can help.

Thanks, Dave