:focus-visible not respecting the outline-color

Not sure if it is intentional but ```outline-color``` does not work alone.

A fix i found is to add ```outline-style : solid;``` on the ```theme.css``` file so it respects the rule.
```css
/* :file src/extra/theme.css */
:focus-visible {
outline-style : solid;
outline-color : var(--link);
}
```

Start in src/extra/theme.css at the :focus-visible rule and review how outline-color behaves without an explicit outline style. Confirm the issue is resolved when outline-color alone is respected, using the provided CSS example as the expected behavior.

Written by the indexing model from the issue text.