1. <!DOCTYPE html>
    2. <html>
    3.     <head>
    4.         <meta charset="utf-8">
    5.         <title></title>
    6.         <link rel="stylesheet" type="text/css" href="button.css"/>
    7.     </head>
    8.     <body>
    9.         <a href="#" class="btn"></a>
    10.     </body>
    11. </html>