.container {
  display: flex;
}


.grid {
  width: 200px;
  height: 400px;
  display: flex;
  flex-wrap: wrap;
  background-repeat: no-repeat;
  background-size: cover;
  background-image: url("https://png.pngtree.com/thumb_back/fw800/background/20190223/ourmid/pngtree-full-aesthetic-aurora-night-sky-background-skystarry-skystarnight-viewbackgroundstar-image_87582.jpg");
}

.grid div {
  height: 20px;
  width: 20px;
}

.tetromino {
  background-color: blue;
}


.mini-grid {
  margin-left: 50px;
  width: 80px;
  height: 80px;
  display: flex;
  flex-wrap: wrap;
  background-color: skyblue;
}

.mini-grid div {
  height: 20px;
  width: 20px;
}