header{background-color:#333;padding:20px;color:#fff;position:fixed;left:0;top:0;width:100%}.logo{font-size:24px;font-weight:700}.navigation{margin-top:20px}.navigation a{text-decoration:none;color:#fff;margin-right:20px}body{font-family:Roboto,Arial,sans-serif;margin:0;padding:0;background-color:#f2f2f2}footer{background-color:#333;padding:20px;color:#fff;text-align:center;position:fixed;left:0;bottom:0;width:100%}main{text-align:center;margin:auto;display:flex;align-items:center;justify-content:center}