html, body {
  width: 100%;
  height: 100%;
  background: #00a84d;
  margin: 0;
}
#board {
  width: 946px;
  position: relative;
  margin: 0 auto;
}
.cells, .stacks {
  width: 107px;
  height: 144px;
  position: absolute;
  background: rgba(0, 0, 0, 0.15);
  border-radius: 5px;
}
.columns {
  width: 107px;
  height: 613px;
  position: absolute;
}
svg {
  width: 107px;
  height: 144px;
  position: absolute;
  transition-property: top, left;
  transition-duration: 100ms;
  transition-timing-function: ease-in-out;
  pointer-events: none;
}
.selected {
  filter: invert(75%);
}