@mixin nb-section() {
  @each $key, $value in $nb-section-spacing {
    $class: '-' + $key;
    .#{$nb-namespace}o-section#{$class} {
      padding-top: $value;
      padding-bottom: $value;
    }

    @each $bp-key, $bp-value in $nb-breakpoints {
      @include nb-respond-to($bp-key) {
        .#{$nb-namespace}o-section#{$class}#{$nb-breakpoint-class}#{$bp-key} {
          padding-top: $value;
          padding-bottom: $value;
        }
      }
    }
  }
}