body {
    background-color: springgreen;
}
nav {
    position: sticky;
    background-color: lightgray;
    top: 0;
    z-index: 1;
}
section img {
    position: static;
    scale: 500%;
    margin: 500px;
}
main {
    position: absolute;
    text-align: center;
    background-color: rgb(255, 255, 180);
    width: 400px;
    height: 400px;
    border: 3px solid;
    margin-top: -800px;
    margin-left: 550px;
}
footer {
    position: relative;
    left: 0;
}
article {
    position: fixed;
    bottom: 0;
    right: 0;
    background-color: rgb(100,100,100);
    border: 1px solid; 
    margin: 3px
}
button:hover {
    background-color: rgb(150,150,150)
}