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The script lets you choose 2 styles, 1 default style for classic lists and another default style for modern lists.

To add/update/change the default CSS style that will be used on any anime and manga lists on MAL:
1 Install the script.
2 Open any anime or manga list. (The whole page will be broken and white at this point till you follow step 3.)
3 Click on the "See this List Style!" button on the Tampermonkey extension menu. (This will show you what the actual user CSS style is.)
4 Click on the "Use this List Style!" button on the Tampermonkey extension menu. (This will make the new displayed style the default override style.)
5 Done! That anime or manga page CSS styles will become the default CSS style that will be used on any anime and manga lists on MAL!

*You can also follow these steps to use any custom CSS that another user made for their own anime/manga lists on MAL!