body {
    font-family: sans-serif;
    margin: 0;
    text-align: center;
    background-color: white;
}

h2 {
    font-size: 40pt;
    margin-bottom: 10px;
}

a {
    text-decoration: none;
    color: black;
}

img {
    display: block;
    width: 70%;
    margin-left: auto;
    margin-right: auto;
}

h3 {
    font-size: 20pt;
}
p {
    font-size: 15pt;
}
nav {
    position: fixed;
    top: 0px;
    width: 100%;
    background-color: gray;
}
nav p,
nav a{
    padding: 15px;
}