html, body, #container {
  width: 100%;
  height: 100%; }

#container {
  display: flex;
  justify-content: center;
  align-items: center; }

h1 {
  width: 1.5em;
  font-family: "ten-mincho";
  font-weight: normal;
  -ms-writing-mode: tb-rl;
  -webkit-writing-mode: vertical-rl;
  writing-mode: vertical-rl;
  margin-top: -2em;
  opacity: 0;
  text-align: center; }
  h1 span {
    opacity: 0;
    font-family: "ten-mincho";
    letter-spacing: 0.4em;
    font-size: 1.3rem; }