body {
  font: 1.1rem/1.2 'Roboto', Helvetica, Arial, Lucida, sans-serif;
  color: #222;
  background: #f7f7f7;
  padding: 50px 15px;
  margin: 0;
}
a {
  color: #5eb189;
  text-decoration: none;
  transition: all 0.2s;
}
a:hover {
  color: #19713a;
}

.page {
  max-width: 550px;
  margin: 0 auto;
  text-align: center;
}

.code {
  display: inline-block;
  color: #e01e5a;
  background: #eee;
  border: 1px solid #ddd;
  border-radius: 2px;
  padding: 2px 5px;
}


.btn {
  /* display: none; */
  color: #fff;
  text-shadow: 0 0 2px #2c5442;
  background: #5eb189;
  border: 1px solid #509775;
  border-radius: 4px;
  padding: 7px 12px;
  text-decoration: none;
  transition: all 0.2s;
}
.btn:hover {
  color: #fff;
  background: #539e7a;
  border: 1px solid #3f7a5e;
}