html, body {
  height: 100%
}

body {
  margin: 0px;
  font-size: 40px;
}

section {
  display: -webkit-box;
  display: -webkit-flex;
  display: -moz-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -moz-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  -moz-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  height: 100%;
}

h1, h2, h3, h4, h5 {
  text-align: center;
}

.note {
  display: none;
}

p {
  text-align: center;
}

pre { white-space:pre }