#panel {
    position: relative !important;
    z-index: 10 !important;
}

#panel:has(#bx-panel) ~ .header {
    top: 147px !important;
    position: absolute !important;
}

#panel:has(#bx-panel.bx-panel-folded) ~ .header {
    top: 40px !important;
    position: absolute !important;
}