.grid {
  background-color: #ccc;
}
[class^="grid__item"] {
  box-sizing: border-box;
  padding: 10px;
  border-radius: 4px;
  color: #fff;
  background-color: rgba(0, 0, 0, 0.8);
  border: 3px dotted #555;
  border-radius: 10px;
}