Explicit_Implicit_Grid.css

body {
  margin: 40px;
}
.wrapper {
    display: grid;
    grid-gap: 10px;
    grid-template-columns: 100px 100px 100px;
    grid-auto-columns: 100px;
    background-color: #fff;
    color: #444;
  }

  .box {
    background-color: #444;
    color: #fff;
    border-radius: 5px;
    padding: 20px;
    font-size: 150%;

  }

  .a {
    grid-column: 1 / 3;
    grid-row: 1;
  }
  .b {
    grid-column: 3 ;
    grid-row: 1 / 3;
  }
  .c {
    grid-column: 1 ;
    grid-row: 2 ;
  }
  .d {
    grid-column: 2;
    grid-row: 2;
  }

  .e {
    grid-column: 4 / 5;
    grid-row: 1 / 4;
  }