@media only screen and (min-width: 600px) {
  html, body { height: 100%; background-color: #646464;}
  #main-content { width: 100%; height: 100%; }
  a.download-butt {display: none;}
}

 a.download-butt {padding: 10px;display: block; color: #ffffff; font-family: arial, san-serif;}