Fixes container overflow on pre>code blocks

[naomiyaki]

Pasted from commit comment: I found that without setting overflow explicitly on the nested <code> element, any non-wrapping code would create an overflow that would scroll the <pre> element, but would therefor leave the code wrapper behind, with overflowing code appearing outside the wrapper (sample attached). This change fixes the UI so all code stays within the wrapper on scroll. Tested in Chrome, Firefox, and Safari (OS X).

[gld1982ltd]

Fixed at https://github.com/skeletonframework/skeletonframework

[mulle-nat]

This is pretty much the first problem ran into when using Skeleton. Thanks for the fix.

[naomiyaki]

This is pretty much the first problem ran into when using Skeleton. Thanks for the fix.

Even though it's been years since I submitted this, it's still always nice to hear! Glad it helped and thanks for the comment.

[naomiyaki]

This looks like it was fixed in another repo. Thank you!