#design_system_style_control select {
    border: 0;
    background: #eee;
}
#design_system_style_control {
    position: fixed;
    left: 0;
    z-index: 999;
    opacity: 0;
    transition: .3s;
    background:transparent;
}
#design_system_style_control:hover {
    opacity: 1;
}