body {
    font-family: Arial, sans-serif;
    background-color: #f8f9fa;
    margin: 0;
    padding: 0;
}

header {
    background: #007bff;
    color: white;
    padding: 15px 20px;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

header a {
    color: white;
    text-decoration: none;
    float: right;
    margin-right: 20px;
    font-size: 16px;
}

main {
    margin: 20px auto;
    max-width: 800px;
    padding: 20px;
    background: white;
    box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}

h1, h2 {
    color: #333;
}

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

table th, table td {
    padding: 10px;
    border: 1px solid #ddd;
    text-align: center;
}

table th {
    background: #007bff;
    color: white;
}

table tr:nth-child(even) {
    background: #f9f9f9;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background: #007bff;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    margin-bottom: 20px;
}

.btn:hover {
    background: #0056b3;
}

button {
    background: #007bff;
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background: #0056b3;
}