body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 20px;
}
.container {
    max-width: 600px;
    margin: auto;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-shadow: 2px 2px 12px rgba(0,0,0,0.1);
}
button {
    margin: 10px;
    padding: 10px;
    background: #28a745;
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 5px;
}
button:hover {
    background: #218838;
}
table {
    width: 100%;
    margin-top: 20px;
    border-collapse: collapse;
}
th, td {
    padding: 10px;
    border: 1px solid #ddd;
}