<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <link href="aaa.css" rel="stylesheet">

</head>

<body>
   <section>
       <article>
           
       </article>
   </section>
   <section></section>
   <section></section>
</body>


</html>
* {

    margin: 0;
    padding: 0;
}

section {
    width: 100%;
    height: 100vh;
  position : relative;
}

section article {
    width: 200px;
    height: 200px;
    background-color: black;
    position: fixed;
    bottom: 50px;
    right: 50px;
}

section:nth-of-type(1){
    background-color: yellow;
}

section:nth-of-type(2){
    background-color: red;
}

section:nth-of-type(3){
    background-color: blue;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.