body {
    font-family: sans-serif;
    background-color: #f0f0f0;
}

.container {
    width: 80%;
    margin: 0 auto;
    padding: 20px;
    background-color: white;
    border: 1px solid #ddd;
}

h1 {
    color: #333;
}

nav {
    background-color: #eee;
    padding: 10px;
    margin-bottom: 20px;
    text-align: right;
}

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

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

th {
    background-color: #f5f5f5;
    text-align: left;
}

a {
    color: #007bff;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.error {
    color: red;
}