.container {
  display: grid;
 grid-template-areas:
    "left right";
 grid-template-columns: 1fr 1fr; 
}

.container > div.left {
  grid-area: left; 
 grid-row: 1;
 grid-column: 1; 
}

.container > div.right {
  grid-area: right; 
 grid-row: 1;
 grid-column: 2; 
}