ebkit-filter: hue-rotate(180deg); }
    }

    @-webkit-keyframes invert-anim {
        from { }
        50%  { -webkit-filter: invert(0.5); }
        to   { -webkit-filter: invert(1); }
    }

    @-webkit-keyframes opacity-anim {
        from { }
        50%  { -webkit-filter: opacity(0.5); }
        to   { -webkit-filter: opacity(0); }
    }

    @-webkit-keyframes brightness-anim {
        from { }
        50%  { -webkit-filter: brightness(0.5); }
        to   { -webkit-filter: brightness(0); }
    }

 