@charset "UTF-8";body{background-size:cover;background-position:center;background-attachment:fixed;margin:0;height:100vh}html,body{height:100%;margin:0}.header{position:fixed;top:0;left:0;width:100%;text-align:center;padding:40px 0;z-index:1000}.header-btn{padding:10px 20px;background-color:#f1f1f1;border:none;border-radius:5px;cursor:pointer}.header-btn:hover{background-color:#ddd}.content{margin-top:60px;padding:20px}