header {
    position: relative;
    height: auto;
    overflow: hidden;
    background-color: #444444;
    margin-bottom: 50px;
}
header .headerForeground {
    z-index: 10;
    position: relative;
    margin: 110px auto 0px auto;
    padding: 0px 10px;
}
header .headerBackground {
    z-index: 0;
    position: absolute;
    top: 0px;
    left: 0px;
    right: 0px;
    bottom: 0px;
}
body.sidebar header {
    margin-left: var( --sidebar-width );
}