html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    background: black;
}

* {
    outline: 0;
}

#container {
    position: relative;
    height: 100%;
}

.slider-handle {
    position: absolute;

    height: 44px;
    width: 44px;

    /* center the element */
    left: 50%;
    top: 50%;

    margin-left: -22px;
    margin-top: -22px;

    border-radius: 50%;

    opacity: 0.5;
    cursor: move;
    z-index: 2;

    background: grey url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32"><path fill="%23FFF" d="M13 21l-5-5 5-5m6 0l5 5-5 5"/></svg>') no-repeat center center;
}

.slider-handle-vertical {
    transform: rotate(90deg);
}
.slider-handle.draggable {
    background-color: #445b7c;
}