.grid{
  display: grid;
  
  }

  .box {
     

  }

  .a {
      grid-column: 1 / 2;
      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;
  }