@mixin hidden {
    background-color: transparent;
    background-image: none;
    border-color: transparent;
    box-shadow: none;
    -gtk-icon-transform: scale(0);

    * {
        background-color: transparent;
        background-image: none;
        border-color: transparent;
        box-shadow: none;
        -gtk-icon-transform: scale(0);
    }
}