Have you added Styles?
these?
This seems to be a problem with your setup. Are they bundled into the html? Is the CSS actually loaded when you open the page or do you get 404s?
If you can share your setup it will be easier to help you
The page doesn’t have 404, and I haven’t made any CSS settings. I just introduced it,maybe CSS was not loaded
For further assistance, please share a CodeSandbox that reproduces your issue in a way that we can inspect it.
ok,thank you Martin!