body {
  background-image: linear-gradient(firebrick, cornflowerblue);
}

.XOBox {
  background-image: linear-gradient(#777, #333);;
  width: 30%;
  height: 30vh;
  float: left;
  margin: .5% /*leftover space on page*/
}

.xo {
  text-align: center;
  margin-right: 42%;
}

.xo img{
  position: absolute;
  width: 13%;
  height: 25vh;
  opacity: 1;
}