.container {
  display: grid;
  grid-gap: 10px;
  grid-template-areas:
    "banner banner"
    "sidebar content";
  grid-template-columns: 1fr 2fr;
}

.container .top {
    grid-area: banner;
}

.container .left {
  grid-area: sidebar;
}

.container .right {
  grid-area: content;
}