body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f9f9f9;
    color: #333;
}

header {
    background-color: #333;
    color: white;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header .logo img {
    height: 40px;
}

header nav a {
    color: white;
    text-decoration: none;
    margin-left: 20px;
    font-weight: bold;
}

main {
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

main h1 {
    text-align: center;
    margin-bottom: 20px;
}

main ul {
    list-style-type: none;
    padding: 0;
}

main ul li {
    margin: 10px 0;
}

main ul li a {
    text-decoration: none;
    color: #007bff;
    transition: color 0.3s;
}

main ul li a:hover {
    color: #0056b3;
}

.back-to-main {
    text-align: center;
    margin-top: 30px;
}

.back-to-main a {
    text-decoration: none;
    color: #333;
    font-weight: bold;
    border: 1px solid #333;
    padding: 5px 10px;
    transition: background-color 0.3s, color 0.3s;
}

.back-to-main a:hover {
    background-color: #333;
    color: white;
}