pre:not([a]) {
  display: block;
  width: 50%;
  top: 10px;
  background-color: rgba(204, 204, 204, 0.8);
  right: 10px;
  border: 1px solid black;
  z-index: 300000000;
  position: absolute;
}
pre:not([a]):nth-of-type(2) {
  left: 32%;
}
pre:not([a]):nth-of-type(3) {
  left: 64%;
}