diff --git a/userContent-files/webpages/raw_githubusercontent.css b/userContent-files/webpages/raw_githubusercontent.css
new file mode 100644
index 0000000..2ae1749
--- /dev/null
+++ b/userContent-files/webpages/raw_githubusercontent.css
@@ -0,0 +1,6 @@
+@-moz-document url-prefix(https://raw.githubusercontent.com) {
+  html {
+    background: var(--primary-dark-color) !important;
+    color: var(--primary-light-color) !important;
+  }
+}
diff --git a/userContent.css b/userContent.css
index 59256ad..f7e0d73 100644
--- a/userContent.css
+++ b/userContent.css
@@ -1598,6 +1598,12 @@
     color: var(--primary-light-color) !important;
   }
 }
+@-moz-document url-prefix(https://raw.githubusercontent.com)  {
+  html {
+    background: var(--primary-dark-color) !important;
+    color: var(--primary-light-color) !important;
+  }
+}
 @-moz-document url-prefix(view-source)  {
   *|*:root {
     background-color: var(--primary-dark-color) !important;
diff --git a/userContent_imports.css b/userContent_imports.css
index 43d7e9c..0e25b1f 100644
--- a/userContent_imports.css
+++ b/userContent_imports.css
@@ -46,3 +46,4 @@
 @import 'userContent-files/webpages/amo_store.css';
 @import 'userContent-files/webpages/manifest.css';
 @import 'userContent-files/webpages/directory_listings.css';
+@import 'userContent-files/webpages/raw_githubusercontent.css';