\: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)}