body {
    font-family: Arial, sans-serif;
    background-color: #f1f8e9;
}
h1 {
    color: #388e3c;
}
.card {
    background: #ffffff;
    padding: 20px;
    margin: 10px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    text-align: center;
}
button {
    padding: 10px 20px;
    background-color: #388e3c;
    color: white;
    border: none;
    cursor: pointer;
}
button.secondary {
    background-color: #81c784;
}
.grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}