.container {
  display: grid; 
  grid-template-columns: 1fr 1fr; 
  grid-template-rows: 1fr; 
  gap: 0px 0px; 
  grid-template-areas: 
    "a b"; 
  width: 100%; 
  height: 100%; 
}
.a { grid-area: a; }
.b { grid-area: b; }