html {
  width: 100%;
  height: 100%;
}
body {
  width: 50%;
  height: 100%;
  margin: 30px auto;
  background-color: #f8f8f8;
  text-align: center;
  font-size: 20px;
  color: #333;
}
div.main {
  width: 100%;
  height: 30%;
  text-align: center;
  background-color: #f0f0f0;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 5px 5px 5px #ccc;
}
a:link    {color:#666;text-decoration:none;}
a:visited {color:#666;text-decoration:none;}
a:hover   {color:#09c;text-decoration:none;}
a:active  {color:#666;text-decoration:none;}