diff --git a/apps/client/src/widgets/type_widgets/code/Markdown.css b/apps/client/src/widgets/type_widgets/code/Markdown.css
index 224fb0d62f..30edf72ffe 100644
--- a/apps/client/src/widgets/type_widgets/code/Markdown.css
+++ b/apps/client/src/widgets/type_widgets/code/Markdown.css
@@ -13,6 +13,11 @@
         overflow: auto;
         padding: 0.5em 1em;
         user-select: text;
+
+        .mermaid-diagram,
+        .mermaid-diagram svg {
+            max-width: 100%;
+        }
     }
 
     .markdown-preview [data-source-line] {