body {
    &::before {
        @each $prefix in $breakpoint-up-prefixes {
            @include breakpoint($prefix) {
                content: '#{$prefix}';
            }
        }
    }

    &::after {
        @each $prefix in $breakpoint-up-prefixes {
            @include breakpoint($prefix) {
                content: '#{$prefix}';
            }
        }
    }
}