CSS for the “Extra” field

I would like to customize the CSS for the “Extra” field in Zotpress. The CSS that customizes this is inline somewhere in the Zotpress code. At least that’s where I think it is – I can’t find any reference to the class (csl-indent) in the CSS files in Zotpress. That means I can’t override it using a CSS file.

Could this be moved to a CSS file? (And, shouldn’t it really be in a CSS file anyway?) I could change it in the Zotpress code as a workaround, but I couldn’t find it.

Here’s the code as it appears in the code inspector in Chrome:
<div class="csl-indent" style="margin: .5em 0 0 2em; padding: 0 0 .2em .5em; border-left: 5px solid #ccc;">(A succinct analysis of key reasons why this proposed rule is deeply flawed.)</div>

Here’s what it looks like with my CSS overlaid by the CSS in Zotpress:

https://www.riverbendadvisors.com/blog/zotpress-other/