*, *:before, *:after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

.demo {
  font-size: 70px;
  height: 100vh;
  text-align: center;
}

.demo-font {
  height: 50%;
  padding: 10px;
  text-transform: uppercase;
}

.demo-font span::before {
  content: '';
  display: inline-block;
  height: 100%;
  vertical-align: middle;
}

.roboto {
  background-color: rgb(0, 166, 157);
  color: white;
  font-family: "Roboto";
}

.open-sans {
  background-color: white;
  color: rgb(0, 166, 157);
  font-family: "Open Sans";
}