h1 {
    color: black;
    font-family: sans-serif;
    font-size: 25px;
    margin 0;
    text-align: center;
}
body {
    background: #A2C8D8;
    font-family: sans-serif;
    margin: 20px auto;
    width: 800px;
}
header {
    background: #599EB9;
    padding: 20px;
    text-align: center;
}
h3 {
    text-align: center;
}
nav {
    padding: 0 20px;
    background: #113341;
    text-align: center;
}
nav a {
    display: inline-block;
    text-decoration: none;
    color: #FFFFFF;
    background: #33667A;
    padding: 5px 10px;
}
nav a.active {
    background: #599EB9;
}
nav a:hover {
    background: #A2C8D8;
}
main {
    background: #FFFFFF;
    padding: 20px;
}
main h2 {
    margin: 0;
}
footer {
    text-align: left;
    padding: 20px;
}