body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

.jumbotron {
    background-color: #f7f7f7;
    padding: 100px 0;
}

.about {
    padding: 50px 0;
}

.navbar-dark {
    background-color: #333;
}

.fixed-top {
    position: fixed;
    top: 0;
    width: 100%;
}