style.css

body {
    min-height: 96vh;
    min-width: 98vw;
    background: #12181f;
    color: white;
}

h1 {
    text-align: center;
    font-weight: 700;
    font-size: 30px;
}

p {
    text-align: center;
    font-size: 20px;
    font-weight: bold;
}

.actions {
    width: 50%;
    justify-self: center;
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.actions button {
    padding: 2px 10px;
    font-size: 30px;
    border-radius: 10px;
    background: #27ae60;
    color: white;
    font-size: 15px;
    border: none;
    cursor: pointer;
    width: 100px;
    height: 50px;
}

.grid-container {
    display: grid;
    justify-content: center;
    gap: 16px;
    grid-template-columns: repeat(9, 80px);
    grid-template-rows: repeat(2, calc(80px / 2 + 2));
}

.card {
    height: calc(100px / 2 * 2);
    width: 80px;
    border-radius: 10px;
    background: white;
    position: relative;
    transform-style: preserve-3d;
    transition: all 0.5s ease-in-out;
}

.front-image {
    width: 60px;
    height: 60px;
}

.card.flipped {
    transform: rotateY(180deg);
}

.front, .back {
    backface-visibility: hidden;
    position: absolute;
    border-radius: 10px;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
}

.card .front {
    display: flex;
    justify-content: center;
    align-items: center;
    transform: rotateY(180deg);
}

.card .back {
    background-image: url("data:image/svg+xml,<svg id='patternId' width='100%' height='100%' xmlns='http://www.w3.org/2000/svg'><defs><pattern id='a' patternUnits='userSpaceOnUse' width='25' height='25' patternTransform='scale(2) rotate(0)'><rect x='0' y='0' width='100%' height='100%' fill='hsla(0,0%,100%,1)'/><path d='M25 30a5 5 0 110-10 5 5 0 010 10zm0-25a5 5 0 110-10 5 5 0 010 10zM0 30a5 5 0 110-10 5 5 0 010 10zM0 5A5 5 0 110-5 5 5 0 010 5zm12.5 12.5a5 5 0 110-10 5 5 0 010 10z'  stroke-width='1' stroke='none' fill='hsla(174, 100%, 29%, 1)'/><path d='M0 15a2.5 2.5 0 110-5 2.5 2.5 0 010 5zm25 0a2.5 2.5 0 110-5 2.5 2.5 0 010 5zM12.5 2.5a2.5 2.5 0 110-5 2.5 2.5 0 010 5zm0 25a2.5 2.5 0 110-5 2.5 2.5 0 010 5z'  stroke-width='1' stroke='none' fill='hsla(187, 100%, 42%, 1)'/></pattern></defs><rect width='800%' height='800%' transform='translate(0,0)' fill='url(%23a)'/></svg>");
    background-position: center;
    background-size: cover;
    backface-visibility: hidden;
}