diff --git a/src/main/java/propertyFiles/MimeTypeDetectionByFileExtension.properties b/src/main/java/propertyFiles/MimeTypeDetectionByFileExtension.properties
index 4beddc68772..f9e0e14716d 100644
--- a/src/main/java/propertyFiles/MimeTypeDetectionByFileExtension.properties
+++ b/src/main/java/propertyFiles/MimeTypeDetectionByFileExtension.properties
@@ -44,3 +44,4 @@ Rmd=text/x-r-notebook
 rb=text/x-ruby-script
 dag=text/x-dagman
 glb=model/gltf-binary
+css=text/css