body {
  /* content position */
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100vh;
  overflow: hidden;
  justify-content: center;
  flex-wrap: nowrap;
  /* style */
  font-size: min(6vw, 9vh);
  font-family: sans-serif;
  /* interaction */
  user-select: none;
}

*, *:focus, *:active, *:hover {
  outline: none;
}