body {
    background-color: lightgreen;
}

h1 {
    text-align: center;
}

h2 {
    color: gray;
    text-align: left;
}

#content {
    margin: 20px 100px 20px 100px;
    padding: 15px;
    background-color: white;
    border-radius: 20px;
    border: 5px solid brown;
}

ul#navbar {
    list-style-type: square;
}

li.navItem {
    float: left;
}
.thumbnail {
    display: block;

    width: 300px;
}