Styles are not applied when using preset

[huynq55]

Hello, I want to ask a question. I installed gatsby-plugin-theme-ui. I created index.js in src/gatsby-plugin-theme-ui with the following content:

`import { swiss } from '@theme-ui/presets'

export default swiss`

however, it looks like the styles are not applied, for example I checked an a tag:

[lachlanjc]

Hey! Is the plugin included in your gatsby-config file? Can you upload a repo to GitHub so folks can take a look?

[huynq55]

I think I forgot to use <Themed.a>

[hasparus]

You can use BaseStyles in use cases where you want to cascade all .styles to children.

<BaseStyles>
  <h1>
    Styled based on <code>theme.styles</code>
  </h1>
</BaseStyles>