body {
    background-color: #f0f0f0;
}

.banner {
    text-align: center;
}

.navbar {
    display: flex;
    justify-content: space-around;
    background-color: #333;
}

.navlink {
    color: white;
    padding: 14px 20px;
    text-decoration: none;
}

.navlink .active {
    background-color: #4CAF50;
}

.container {
    padding: 20px;
}