<!DOCTYPE html>
<html>
    <head>
        <meta charset=utf-8>
        <style type="text/css">
            * {
                margin: 0;
                padding: 0;
            }
            .left {
                width: 100px;
                height: 100px;
                background-color: black;
            }
            .center {
                width: 100px;
                height: 100px;
                position: relative;
                background-color: red;
                left: 50px;
                top: 50px;
            }
            .right {
                width: 100px;
                height: 100px;
                background-color: yellow;
            }
        </style>
    </head>
    <body>