.container {
        display: grid;
        grid-gap: 20px;
        /* Make the grid 10 columns wide, every other taking up twice the free space */
        grid-template-columns: repeat(5, 1fr 2fr);
        /* Make the grid have 10 explicit rows, 50px high each */
        grid-template-rows: repeat(10, 50px);
      }

      /* With Item 1, start at col 3 and go until 5 */
      .item1 {
        grid-column: 3 / 5;
      }

      /* With Item 2, start at col 5 and go until the end */
      .item2 {
        grid-column: 5 / -1;
      }

      /* Make Item 5 double span 2 cols and rows */
      .item5 {
        grid-column: span 2;
        grid-row: span 2;
      }

      /* Make Item 8 two rows high */
      .item8 {
        grid-row: span 2;
      }

      /* Make Item 15 span the entire grid width */
      .item15 {
        grid-column: 1 / -1;
      }

      /* Make item 18 span 4 widths, but end 9 */
      .item18 {
        grid-column: span 4;
        grid-column-end: 9;
      }

      /* Make item 20 start at row 4 and go for 3 */
      .item20 {
        grid-row-start: 4;
        grid-row: span 3;
      }