* {
  font-family: "ヒラギノ角ゴ ProN W3";
  margin: 0;
}

#container {
  display: flex;
  justify-content: center;
  flex-direction: row;
  /* position: relative; */
}

header {
  display: flex;
  justify-content: center;
}

body {
  margin: 0;
}

header + h1 {
  position: fixed;
  right: 0;
  top: 0;
  opacity: 0.5;
  z-index: -999;
  font-size: 1em;
}