diff --git a/common/static/css/tinymce-studio-content.css b/common/static/css/tinymce-studio-content.css
index 724c2737b6..c01f772e05 100644
--- a/common/static/css/tinymce-studio-content.css
+++ b/common/static/css/tinymce-studio-content.css
@@ -109,6 +109,7 @@
 
 .mce-content-body img {
     max-width: 100%;
+    height: auto;
 }
 
 .mce-content-body pre {