button.css

@media all and (min-width: 100em) and (hover: hover) {

    /* Change fab (round) buttons icon color when hovering */
    .emby-button.fab:hover {
        color: #a7c4bc;
        background-color: #404040;
    }

    /* Add some margin to block buttons so they don't overlap with the animation */
    .emby-button.block {
        margin: .75em 0;
    }

    /**********************************************************/
    /*     emby-button 3D effect hovering using ::before      */
    /*               — used for every square buttons          */
    /**********************************************************/

    .emby-button.raised {
        transform-style: preserve-3d;
        transition: transform 0.05s ease;
    }

    .emby-button.raised::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        display: block;
        border-radius: inherit;
        width: 100%;
        height: 100%;
        transition: transform 0.05s ease;
        transform: translate3d(0, 0, -1px);
        /* z-index doesn't work with transform (it creates a separate context) so 
        we have to use translate3D to put it behind or in front using Z axis */
    }

    /* Move button up when it is hovered to simulate a real 3D tangible button */
    .emby-button.raised:hover {
        transform: translate3d(0, -6px, 1px);
    }

    .emby-button.raised:hover::before {
        transform: translate3d(0, 6px, -1px);
    }

    /* Move button down when it is clicked to simulate a physical push */
    .emby-button.raised:active {
        transform: translate3d(0, -2px, 1px);
    }

    .emby-button.raised:active::before {
        transform: translate3d(0, 2px, -1px);
    }

    /* Color set for gray buttons like refresh */
    .emby-button.raised:not(.button-submit):not(.button-delete)::before {
        background: #262626;
    }

    .emby-button.raised:not(.button-submit):not(.button-delete) {
        background: #303030;
    }

    /* Color set for blue buttons like save */
    .emby-button.raised.button-submit::before {
        background: #0080ff;
    }

    .emby-button.raised.button-submit {
        background: #3399ff;
    }

    /* Color set for red buttons like delete */
    .emby-button.raised.button-delete {
        background: #f70000;
    }

    .emby-button.raised.button-delete::before {
        background: #b30000;
    }

}