.Boi {
  position: fixed;
  z-index: 99999999;
  color: #FFF;
  background-color: rgba(0, 0, 0, 0.5);
  padding: 0.25em 0.5ch;
  font-size: 3vmax;
  line-height: 1.33em;
  font-family: sans-serif;
}

.Boi-left {
  left: 0;
  top: 50%;
  transform: translate(0, -50%);
}

.Boi-centre {
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background-color: rgba(0, 0, 0, 0.75);
  font-size: 5vmax;
}

.Boi-right {
  right: 0;
  bottom: 0;
  font-size: 2vmax;
}