fix: revert overflow-hidden for SlideWrapper

[murilo-cunha]

Hi, thanks a lot for this project! Slidev's my go-to tooling these days. Big fan of the project!

This PR:

• Allow overflow to be visible to enable negative margins for styling

I like to style my slides with negative margins (especially when using two-cols, etc.) but with the change introduced in c820e23, it was hard to customize it to my liking.

Not sure there are any other side effects to this change, but it took me some time to fix it so I figured I'd open a PR :)

My current workaround was to include in styles/main.css:

.slidev-page {
  /* https://github.com/slidevjs/slidev/commit/c820e23b10581191a42bbf51c04bfd2caa49077a */
  overflow: visible !important;
}

[netlify]

✅ Deploy Preview for slidev ready!

Name	Link
🔨 Latest commit	4c3637f
🔍 Latest deploy log	https://app.netlify.com/sites/slidev/deploys/660c193fb3328f0008ad7c81
😎 Deploy Preview	https://deploy-preview-1493--slidev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[antfu]

Can you elaborate more what you want to do and why is this needed?

[murilo-cunha]

In general so I can use negative margins to adjust the content.

Sometimes I like to have images partially over/covering each other in my slides (when using two-cols layout.

Or to make quick adjustments on the spacing for text.

I'm not sure if the overflow-hidden has other side effects, but I was using it as a quick way to increase the spacing of elements via negative margins

[KermanX]

In fact, in #1462 I also did this change. It seems that this pverflow-hidden is redundant and not other slide wrappers don't have this class.