QoL for <details>/<summary> elements

[mataiodoxion]

There isn't a clear indicator where a <details>/<summary> tag starts and ends when parsed:

capyreader_details.mp4

Better behavior (actual site has some border for the details box): https://maurycyz.com/misc/battery/#:~:text=test%3A-,The,such%2E

Couldn't find any similar discussions, but I think the fix would be an easy style change (I'd be happy to PR this). Thanks!