Removing the shadows from the dropdown menus? I tried some CSS in the comments but it didn't work.

    
.menupopup-arrowscrollbox, .menupopup-arrowscrollbox::part(content), &::part(content) {
    box-shadow: none !important;
    border: none !important;
}

menupopup, panel {
    --panel-shadow: none !important;
}

menupopup > menu {
    box-shadow: none !important;
}