body {
    font-family: arial;
    margin: auto;
    width: 1500px;
    background: #e0e1ba;
}
header {
    background: #afdb82;
    padding: 10px;
}
h1 {
    color: white;
    font-family: arial;
    text-align: center;
}
nav {
    background: white;
    text-align: center;
}
nav a {
    display: inline-block;
    color: black;
    text-decoration: none;
    padding: 25px 20px;
    font-size: 25px;
}
h3 {
    color: white;
}
main {
    background: #afdb82;
    padding: 20px;
}
nav img {
    width: 20%;
    vertical-align: middle;
}
main img {
    width: 20%;
    float: right;
    margin: 20px;
    border: 1px solid black;
}
.active {
    color: #afdb82;
}