html,
body {
  position: relative;
  width: 100%;
  height: 100%;
}

body {
  display: grid;
  color: #fff;
  background-color: #333;
  margin: 0;
  padding: 8px;
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  font-size: 20px;
}

@media (min-width: 640px) {
  body {
    align-content: center;
  }
}