Can a document render width be adjusted?

I realize this convo is necro’d but my solution is to post the following at the bottom of any page I want to adjust the max-width. (In case someone else is looking for a quick solution)

<style>
.markdown-body {
    max-width: 1150px !important;
<!-- Leave this section to allow enough room to view wider content. (i.e. tables) -->    
</style>
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