hugo-theme-zzo/assets/sass/pages/_wrapper.scss

$grid_max_width: 960;

@if global-variable-exists(viewport_size) {
    @if $viewport_size == widest {
        $grid_max_width: 1600;
    } @else if $viewport_size == wider {
        $grid_max_width: 1440;
    } @else if $viewport_size == wide {
        $grid_max_width: 1280;
    } @else if $viewport_size == narrow {
        $grid_max_width: 800;
    } @else {
        $grid_max_width: 960;
    }
}

$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: -0.5rem;
    height: 100vh;
    width: calc((100vw - #{$grid_max}) / 2);

    &[data-pad="false"] {
      left: 0;
    }
  }

  &__right {
    position: fixed;
    top: 0;
    right: -0.5rem;
    height: 100vh;
    width: calc((100vw - #{$grid_max}) / 2);

    &[data-pad="false"] {
      right: 0;
    }
  }
}