* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f4f4f4;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.card {
    width: 300px;
    height: 180px;
    border-radius: 15px;
    perspective: 1000px;
    margin-bottom: 20px;
}

.card-front,
.card-back {
    width: 100%;
    height: 100%;
    border-radius: 15px;
    position: absolute;
    top: 0;
    left: 0;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 20px;
    color: white;
}

.card-front {
    background-color: #2c3e50;
}

.card-back {
    background-color: #34495e;
    transform: rotateY(180deg);
    justify-content: flex-end;
    padding: 10px;
}

.card-number {
    font-size: 1.4em;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.card-name,
.expiry-date {
    font-size: 1em;
}

.logo {
    font-size: 1.5em;
    font-weight: bold;
}

.cvv {
    font-size: 1.5em;
    letter-spacing: 2px;
}

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

button {
    padding: 10px;
    font-size: 1em;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background-color: #2980b9;
}