$border-radius-data: (
  large: .375rem,
  x-large: .5rem,
  none: 0,
  base: .25rem,
  md: .375rem,
  lg: .5rem,
  xl: .75rem,
  "2xl": 1rem,
  full: 9999px
);

@function border-radius($size: base) {
  $value: map-get($border-radius-data, $size);

  @if type-of($value) != number {
    @error "Border radius size `#{$size}` not found.";
  }

  @return $value;
}