Untitled

<!DOCTYPE HTML>
<html>
<head> <link rel="stylesheet" type="text/css" href="css.css"/> </head>
<body>
<center> <h1> Simon Says! </h1>
<div id="square"> </div>
</center>
</body>
</html>

 #square{
        width:100px;
        height:100px;
        background:red;
        position:center-left;
        }