$grid_max: $grid_max_width + $grid_max_unit; .wrapper { margin: 0 auto; position: relative; @include justify-content(center); @include themify($themes) { background-color: themed('body-background-color'); } @media only screen and (max-width: 769px) { grid-template-columns: minmax(0, $grid_main_main) minmax(0, $grid_main_side); } &__left { position: fixed; top: 0; left: 0; height: 100vh; width: calc((100vw - 980px) / 2); } &__right { position: fixed; top: 0; right: 0; height: 100vh; width: calc((100vw - 980px) / 2); } }