Custom document width

Hey everyone!

I always use the fixed width feature of SiYuan to keep my notes organized even on wide monitors. However, I think the feature is missing something: a way to set the width of the fixed width mode.

I see that right now it's ~750px, but I personally think it's a bit too narrow.
Other PKM/note-taking software solves this issue of personal preference with a setting. For example, on Joplin, I used to have it set at 1000px.

Can the same feature be replicated in SiYuan?

I guess that some CSS snippets would do the trick, I've tried a couple of different things but they're not a perfect solution. Has anyone gotten a good result?

I hope this feature will eventually become a setting, just like Joplin. Thanks!