x 10px 0.3fr 10px 0.7fr;
  grid-template-rows: auto 20px auto;
}

.grid-element {
  background-color: #444;
  color: #fff;
  padding: 20px;
  font-size: 2em;
}

.element-a {
  grid-column-start: 1;
  grid-column-end: ;
  grid-row-start: 1;
  grid-row-end: 2;
  background: #6F9;
}

.element-b {
  grid-column-start: 3;
  grid-column-end: 4;
  grid-row-start: 1;
  grid-row-end: 2;
  background: #69F;
}

.element-c {
  grid-column-start: 5;
  grid-column-end: 6;
  grid-row-start: 1;
  grid-row-end: 2;
  backgro