make dark theme look better

docs/assets/github-dark-dimmed.css

@@ -0,0 +1,15 @@
+pre code.hljs{display:block;overflow-x:auto;padding:1em}code.hljs{padding:3px 5px}/*!
+  Theme: GitHub Dark Dimmed
+  Description: Dark dimmed theme as seen on github.com
+  Author: github.com
+  Maintainer: @Hirse
+  Updated: 2021-05-15
+  Modified: 2022:12:27 by @michalsn
+
+  Colors taken from GitHub's CSS
+*/.hljs{color:#adbac7 !important;background-color:#22272e !important}.hljs-doctag,.hljs-keyword,.hljs-meta .hljs-keyword,.hljs-template-tag,.hljs-template-variable,.hljs-type,.hljs-variable.language_{color:#f47067}.hljs-title,.hljs-title.class_,.hljs-title.class_.inherited__,.hljs-title.function_{color:#dcbdfb}.hljs-attr,.hljs-attribute,.hljs-literal,.hljs-meta,.hljs-number,.hljs-operator,.hljs-selector-attr,.hljs-selector-class,.hljs-selector-id,.hljs-variable{color:#6cb6ff}.hljs-meta .hljs-string,.hljs-regexp,.hljs-string{color:#96d0ff}.hljs-built_in,.hljs-symbol{color:#f69d50}.hljs-code,.hljs-comment,.hljs-formula{color:#768390}.hljs-name,.hljs-quote,.hljs-selector-pseudo,.hljs-selector-tag{color:#8ddb8c}.hljs-subst{color:#adbac7}.hljs-section{color:#316dca;font-weight:700}.hljs-bullet{color:#eac55f}.hljs-emphasis{color:#adbac7;font-style:italic}.hljs-strong{color:#adbac7;font-weight:700}.hljs-addition{color:#b4f1b4;background-color:#1b4721}.hljs-deletion{color:#ffd8d3;background-color:#78191b}
+
+[data-md-color-scheme="default"] {
+    --md-default-fg-color--lightest: #575757;
+    --md-default-fg-color--light: #959595;
+}

mkdocs.yml

@@ -8,15 +8,17 @@ theme:
   icon:
     repo: fontawesome/brands/github
   palette:
-    # Palette toggle for light mode
     - media: "(prefers-color-scheme: light)"
       scheme: default
+      primary: indigo
+      accent: indigo
       toggle:
         icon: material/brightness-7
         name: Switch to dark mode
-    # Palette toggle for dark mode
     - media: "(prefers-color-scheme: dark)"
       scheme: slate
+      primary: indigo
+      accent: indigo
       toggle:
         icon: material/brightness-4
         name: Switch to light mode
@@ -38,7 +40,7 @@ markdown_extensions:
       use_pygments: false
 
 extra_css:
-  - https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.6.0/build/styles/github.min.css
+  - assets/github-dark-dimmed.css
 
 extra_javascript:
   - https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.6.0/build/highlight.min.js