#sidebar-header {
    font-size: 1.2em !important;
    padding: 2px 6px 2px 3px !important;
}

#sidebar-header #sidebar-close {
    padding: 3px !important;
}

#sidebar-header #sidebar-close .toolbarbutton-icon {
    width: 14px !important;
    height: 14px !important;
    opacity: 0.6 !important;
}