<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Center align button</title>
    <style>
        button {
           position: fixed;
           left: 50%;
        }
    </style>
</head>
<body>
    <div class="button-container-div">
        <button>Hover Me!</button>
    </div>
</body>
</html>