body {
    font-family: Arial;
    max-width: 800px;
    margin: auto;
    background: #f5f5f5;
}

h1 {
    text-align: center;
}

table {
    width: 100%;
    background: white;
    border-collapse: collapse;
}

td, th {
    padding: 8px;
    border: 1px solid #ccc;
}

button {
    padding: 5px 10px;
    cursor: pointer;
}