Espresso Mastodon is a userstyle which is heavily based and reliant on the Discord Espresso theme color varriables, which means that all color schemes for the Discord theme will also work with this userstyle!
If you choose to edit the userstyle, you will find a comment dedicated to the theme source and color palletes. From here, you can choose any of the dark color schemes you desire. Check them out here!
If you choose to edit the userstyle, you will find a comment dedicated to the accent varriables. Uncomment the whole thing, and change the color values to your desired ones.
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Stylus users on Firefox have to be on version 102 or later and toggle "Patch CSP to allow style assets"
Chromium browsers shall be fine by default on any recent version.