*,html,body {
  font-family: sans-serif;
  line-height: 1.5em;
  font-size: 1.0em;
}

.mycontent {
  padding: 0;
  margin: auto;
  display: block;
  width: 800px;
  height: 600px;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}