body{
  margin: 0;
}

.led_on{
  background-image: url("../imgs/qiang.png");
}

td {
  width: 30px;
  height: 30px;
  background-image: url("../imgs/led.png");
}

.play{
  background-image: url("../imgs/play.png");
  background-position: center;
  background-repeat: no-repeat;
}

.box{
  background-image: url("../imgs/box.png");
}

.target{
  background-image: url("../imgs/target.png");
}

.parent {
display: grid;
grid-template-columns: 3fr 0.5fr;
grid-template-rows: 1fr;
grid-column-gap: 0px;
grid-row-gap: 0px;
}

.div1 {
  grid-area: 1 / 1 / 2 / 2;
  place-self: center;
}
.div2 { grid-area: 1 / 2 / 2 / 3; }