message: docs: add border radius
diff: @@ -8,6 +8,7 @@ You can create your own theme, just change some variables in your css `:root`:
  ```css
  :root {
  + --border-radius: 4px;
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 16px;
  