.container {
  height: 90vh;
  display: grid;
  grid-template-columns: 1fr 4fr 6fr;
  grid-template-rows: auto;
	border: 1px solid blue;
}

.box {
  display: flex;
	border: 3px solid black;
}

.box-b {
	display: grid;
  grid-template-rows: 2fr 2fr 4fr;
}