Updated to work on Linux Mint 20.3 (Una)
Menu, Panel, and Calender only (cinnamon.css).
Does not include Windows Borders or Controls.
To use:
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Make a copy of a theme found in usr/share/themes. (i used Mint-Y-Dark so that would be a good choice).
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Go to your home folder and under view on the menu click "show hidden folders" and look for .themes folder.
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If .themes doesnt exist, create it. Right click >> Create New Folder, >> type .themes
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Paste the theme you copied into the .themes folder.
If you have to create a .themes folder, it should have a period in front of it >> .themes
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Replace the cinnamon.css in your copy of Mint-Y-Dark with cinnamon.css found above.
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Rename new copy to Chocolate Mint (or whatever..)
It should now show up in your themes under: System Settings >> Themes >> Desktop
Enjoy.