style.css

*,
*:before,
*:after {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: "Rubik", sans-serif;
}

body {
    height: 100%;
    background: linear-gradient(
        to right,
        #575ce5 50%,
        #f9fbfc 50%
    ) fixed;
}

.container {
    background-color: #ffffff;
    width: 400px;
    padding: 50px;
    position: absolute;
    transform: translate(-50%, -50%);
    top: 50%;
    left: 50%;
    box-shadow: 15px 30px 35px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    -webkit-perspective: 300px;
    perspective: 300px;
}

.stats {
    text-align: right;
    color: #101020;
    font: 25px;
    line-height: 25px;
}

.coin {
    height: 150px;
    width: 150px;
    position: relative;
    margin: 50px auto;
    -webkit-transform-style: preserve-3d;
    transform-style: preserve-3d;
}

.coin img {
    width: 145px;;
}

.heads,
.tails {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

.tails {
    transform: rotateX(180deg);
}

@keyframes spin-tails {
    0% {
        transform: rotateX(0);
    }
    100% {
        transform: rotateX(1980deg);
    }
}

@keyframes spin-heads {
    0% {
        transform: rotateX(0);
    }
    100% {
        transform: rotateX(2160deg);
    }
}

.buttons {
    display: flex;
    justify-content: space-between;
}

button {
    width: 120px;
    padding: 10px 0;
    border: 2.5px solid #424ae0;
    border-radius: 5px;
    cursor: pointer;
}

#flip-button {
    background-color: #424ae0;
    color: #ffffff;
}

#flip-button:disabled {
    background-color: #e1e0ee;
    border-color: #e1e0ee;
    color: #101020;
}

#reset-button {
    background-color: #ffffff;
    color: #424ae0;
}