.coin-scene {
    width: 120px;
    height: 120px;
    margin: 40px auto;
    perspective: 1000px;
}

.coin {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 2s cubic-bezier(.17,.67,.83,.67);
}

.coin-face {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    font-size: 48px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    backface-visibility: hidden;
}

.heads {
    background: gold;
    color: black;
}

.tails {
    background: silver;
    color: black;
    transform: rotateY(180deg);
}