Jekyll Rouge washed out Monokai color

I'm using Github Pages Jekyll static website generator with Cayman theme on Rouge Monokai syntax highlighting on my website.

I used the instructions from this answer.

I copied the scss from: https://raw.githubusercontent.com/jwarby/pygments-css/master/monokai.css

And posted it into assets/css/style.scss on the website.

Non-language markdown color formatting has faint text:

jekyll rouge default.png

This isn't the question but it is easier to read like pycharm doc string good ole monochrome monitor green:

enter image description here

The BIG problem

When it comes to Github's default markdown (for Python) it looks OK when previewed:

jekyll rouge markdown github style.png

However when you save the page, Krampdown or RedCarpet or whomever generates the HTML incorrectly using the ``` python code block:

jekyll rouge markdown python error.png

If it helps here is the content of my _config.yml:

theme: jekyll-theme-cayman
title: pippim - Open-source
description: Free open-source software for the World. Free of Ads too!

kramdown:
  syntax_highlighter: rouge
  input: GFM

How can I get Rouge formatting to work properly using the Monokai theme?

How many English words
do you know?
Test your English vocabulary size, and measure
how many words do you know
Online Test
Powered by Examplum