Archipelago/WebHostLib/static/styles/header/dirtHeader.css

html{
    background-image: url('../../static/backgrounds/dirt/dirt-0005-large.png');
    background-repeat: repeat;
    background-size: 900px 900px;
}

#base-header{
    background: url('../../static/backgrounds/header/dirt-header.png') repeat-x;
}