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                <div class="my-grid">
  <div class="col c1">1</div>
  <div class="col c2">2</div>  



                * {
  box-sizing: border-box;
.my-grid {
  display: grid;
  grid-template-columns: auto auto;
  grid-gap: 0;
  border: 1px solid green;
  /*     margin: 0 auto; */
  /*  ^ This works as expected now!   */
  width: 700px;
  /*  Toggle commenting above property to the wow behaviour.  */
.col {
  border: 1px solid red;
  background: aquamarine;
  width: 300px;
  height: 100px;

.c1 {
/*   margin-left: auto; */
  /* <= Aligning it to right edge of column this way works too but using justify-self is more inttutional as per grid usage practises.*/
  justify-self: end;
/*  ^ This is what we need to use grids to get our elements in the end of the column area. Yo!!!  */
.c2 {
  /*  already left aligned... , yo!!  */