diff --git a/res/themes/tchap-dark/css/tchap-dark.pcss b/res/themes/tchap-dark/css/tchap-dark.pcss
index 68fdccf970..ed47c781bb 100644
--- a/res/themes/tchap-dark/css/tchap-dark.pcss
+++ b/res/themes/tchap-dark/css/tchap-dark.pcss
@@ -10,3 +10,4 @@
 @import "../../../../node_modules/matrix-react-sdk/res/css/_components.pcss";
 @import "../../tchap-common/css/_tchap_custom.pcss"; /* import override from the common folder */
 @import url("highlight.js/styles/atom-one-light.css");
+@import url("github-markdown-css/github-markdown-dark.css");
\ No newline at end of file
diff --git a/res/themes/tchap-light/css/tchap-light.pcss b/res/themes/tchap-light/css/tchap-light.pcss
index f5592ebae5..d01b0b3da8 100644
--- a/res/themes/tchap-light/css/tchap-light.pcss
+++ b/res/themes/tchap-light/css/tchap-light.pcss
@@ -9,3 +9,4 @@
 @import url("highlight.js/styles/atom-one-light.css"); /* taken from matrix theme, don't know what it is */
 @import "../../tchap-common/css/_tchap_custom.pcss"; /* import override from the common folder */
 @import "_tchap_custom.pcss";
+@import url("github-markdown-css/github-markdown-light.css");
\ No newline at end of file