nav {
    position: fixed;
    top: 0;
}


section {
    position: relative;
}


img {
    position: static;
    width: 50%;
    height: auto;
    display: block;
    margin: auto;
}

section p {
    position: absolute;
    top: 50%;
    left: 50%;
}

footer {
    position: relative;
    left: 0;
    margin-top: 500px;
}