body {
    font-family: -apple-system, sans-serif;
    padding: 20px;
    background-color: #f4f7f6;
    text-align: center;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    display: inline-block;
}

input {
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    width: 200px;
}

button {
    padding: 12px 20px;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: bold;
    cursor: pointer;
}