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


#container {
width: 100vw;
height: 100vh;
background-color: black;
float: left;
clear: both;


}

/* this is our game square. */
.gameSquare {
  background-color: yellow;
  width: 23vh;
  height: 23vh;

/* the above are changed by JS and below we don't change them..*/

  margin: 1vh;
  float: left;
  border-radius: 9px;
}



.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;
}