body {
    background-color: white;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: auto;
}

h1 {
    background-color: #003366;
    color: white;
    padding: 15px;
    text-align: center;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

th, td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: center;
}

th {
    background-color: #003366;
    color: white;
}

button {
    padding: 5px 10px;
    background-color: red;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background-color: darkred;
}

#message {
    margin-top: 20px;
    color: green;
    font-weight: bold;
}

.hidden {
    display: none;
}