index.css

html, body {
  font-size: 16px;
}

html {
  background-color:#9F1D35;
  height: 100%;
}

@media screen and (max-width: 850px) {
  html, body {
    font-size: 10px;
  }
}

@media screen and (max-width: 600px) {
  html, body {
    font-size: 7px;
  }
}

@media screen and (max-width: 600px) {
  html, body {
    font-size: 5px;
  }
}

body {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  position: absolute;
  display: table;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
  text-align: center;
  margin: 0;
  padding: 0;
  border: 0;
  width: 100%;
  height: 100%;
}

#suggestion {
  text-decoration: none;
  cursor: default;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  margin-bottom: 0.25em;
  display: table-cell;
  vertical-align: middle;
  width: 100%;
  font-family: 'Bitter', serif;
  font-size: 7.5rem;
  color: white;
}