styles.css

.DIFI {
    border: solid 1px #ccc;
    width: 100%;
    margin: 10px auto;
    padding-top: 40%;
    position: relative;
}

.DIFI-controls {
    left: 10px;
    position: absolute;
    text-align: center;
    top: 10px;
}

.DIFI-controls button {
    margin-right: 5px;
    padding: 0 1.5rem;
}

.DIFI-range {
    position: absolute;
    left: 10%;
    right: 10%;
    top: 55%;
    padding-top: 20%;
    transform: translateY(-50%);
}

.DIFI-me {
    background-color: rgba(255, 255, 255, .8);
    border: solid 1px #000;
    border-radius: 50%;
    cursor: move;
    cursor: grab;
    cursor: -webkit-grab;
    padding-top: 25%;
    position: absolute;
    left: 0;
    top: 0;
    width: 25%;
    user-select: none;
}

.DIFI-me.dragging {
    cursor: move;
    cursor: grabbing;
    cursor: -webkit-grabbing;
}

.DIFI-me label {
    cursor: move;
    cursor: grab;
    cursor: -webkit-grab;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.DIFI-group {
    background-color: #ccc;
    background-position: 50% 50%;
    background-size: cover;
    border-radius: 50%;
    left: 80%;
    padding-top: 30%;
    position: absolute;
    top: 55%;
    transform: translate(-50%, -50%);
    width: 30%;
}

.DIFI-group label {
    position: absolute;
    left: 50%;
    top: 0;
    transform: translate(-50%, -100%);
    white-space: nowrap;
}