.container {
  width: 300px;
  height: 300px;
  margin: 10px auto;
  border: 1px solid grey;
  display: grid;
  grid-template-rows: repeat(3, 1fr);
  grid-template-columns: repeat(3, 1fr);
  div {
    box-sizing: border-box;
    border: 1px solid purple;
    background-color: purple;
    padding: 10px;
    background-clip: content-box;
    grid-area: 2/2/3/3;
  }
}