fix: overflowing story content overlaps sidebar

[tlow92]

Issue: If the content of a story overflows the container it might overlap with the sidebar, preventing interactions with it.

What I did

Set overflow: hidden to the content container.

For demonsteration purpose I changed the Button styles, but it's not part of the PR. @dannyhw Let me know if I should add an example story to demonstrate this.

[dannyhw]

hey @tlow92 thanks for the contribution 🙏

can you add an example to the example project which can show the problem/fix to make sure there is no regression

[dannyhw]

I noticed theres actually a similar issue on mobile, pushed a similar change for that layout