:root {
    // Custom variable values only support SassScript inside `#{}`.
    @each $color, $value in $colors {
        --#{$color}: #{$value};
    }

    @each $color, $value in $theme-colors {
        --#{$color}: #{$value};
    }

    @each $bp, $value in $grid-breakpoints {
        --breakpoint-#{$bp}: #{$value};
    }

    // Use `inspect` for lists so that quoted items keep the quotes.
    // See https://github.com/sass/sass/issues/2383#issuecomment-336349172
    --font-family-sans-serif: #{inspect($font-family-sans-serif)};
    --font-family-monospace: #{inspect($font-family-monospace)};
}