@supports (display: grid) {
    .site-grid {
        grid-template-areas:
          ". banner banner banner banner ."
          ". top-a top-a top-a top-a ."
          ". top-b top-b top-b top-b ."
          ". side-l side-l side-l side-l ."
          ". comp comp comp comp ."
          ". side-r side-r side-r side-r ."
          ". bot-a bot-a bot-a bot-a ."
          ". bot-b bot-b bot-b bot-b .";
    }
    @media (min-width: 992px) {
        .site-grid {
            grid-template-areas:
              ". banner banner banner banner ."
              ". top-a top-a top-a top-a ."
              ". top-b top-b top-b top-b ."
              ". side-l comp comp side-r ."
              ". bot-a bot-a bot-a bot-a ."
              ". bot-b bot-b bot-b bot-b ."
        }
    }
}