body {
  font-family: courier, monospace;
  font-size:20px;
  padding-top:20px;
}

.container {
  text-align:center;  
}

#content {
  margin:0 auto;  
  max-width:600px;
}

.btn {
  background:#eee;
  border-radius:0;
  color:#666;
  display:inline-block;
  font-size:20px;
  margin:0 auto;
  padding:20px;
  transition: background 0.2s linear;
  text-decoration:none;
}

.btn:hover {
  background:#aaa;
  color:#fff;
  transition: background 0.2s linear;
}