body.dark {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #121212;
    color: #f5f5f5;
}

.top-navbar {
    background-color: #1e1e1e;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 18px;
    color: #fff;
    text-decoration: none;
}

.nav-right .btn {
    background-color: #333;
    color: #f5f5f5;
    padding: 6px 12px;
    text-decoration: none;
    margin-left: 10px;
    border-radius: 4px;
    font-size: 14px;
}

.top-menu {
    background-color: #2b2b2b;
    padding: 10px;
    display: flex;
    justify-content: center;
}

.top-menu a {
    margin: 0 15px;
    color: #bbb;
    text-decoration: none;
}

.top-menu a.active {
    font-weight: bold;
    color: #fff;
}

main {
    padding: 30px;
    max-width: 900px;
    margin: auto;
}