Add files

assets/css/just-the-docs-dark.scss

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+---
+---
+{% include css/just-the-docs.scss.liquid color_scheme="dark" %}

assets/css/just-the-docs-default.scss

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+---
+---
+{% if site.color_scheme and site.color_scheme != "nil" %}
+  {% assign color_scheme = site.color_scheme %}
+{% else %}
+  {% assign color_scheme = "light" %}
+{% endif %}
+{% include css/just-the-docs.scss.liquid color_scheme=color_scheme %}

assets/css/just-the-docs-head-nav.css

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+---
+---
+{%- if site.color_scheme and site.color_scheme != "nil" -%}
+  {%- assign color_scheme = site.color_scheme -%}
+{%- else -%}
+  {%- assign color_scheme = "light" -%}
+{%- endif -%}
+
+{%- capture newline %}
+{% endcapture -%}
+
+{%- capture scss -%}
+{% include css/just-the-docs.scss.liquid color_scheme=color_scheme %}
+.site-nav ul li a {
+  background-image: linear-gradient(
+    -90deg,
+    rgba($feedback-color, 1) 0%,
+    rgba($feedback-color, 0.8) 80%,
+    rgba($feedback-color, 0) 100%
+  );
+}
+{%- endcapture -%}
+
+{{ scss | scssify | split: newline | slice: -3, 3 | join: newline }}

assets/css/just-the-docs-light.scss

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+---
+---
+{% include css/just-the-docs.scss.liquid color_scheme="light" %}