That's fine, everything doesn't have to look the same everywhere. It does matter when there's functionality a site relies on but it's not available in one out more browser/OS combinations.
Yes, I agree that using the native OS UI is the right choice. Imagine if every web browser had a different file picker dialog, it would be a pain to have to reorient yourself just for that product.
However, I do lament the antiquated Windows 95 color picker. It seems less functional than others that I've used.
Firefox uses the native OS color picker, which in Windows 11 still looks unchanged from Windows 95.
However, I do lament the antiquated Windows 95 color picker. It seems less functional than others that I've used.