html,
body {
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  background: #000;
}

main {
  display: flex;
}

p {
  line-height: 1;
}

span {
  display: block;
  width: 2vmax;
  height: 2vmax;
  color: #9bff9b11;
  text-align: center;
  font-family: cursive;
}