diff --git a/_layouts/default.html b/_layouts/default.html
index e85e407..90a8c2c 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -46,5 +46,6 @@
         x.previousElementSibling.previousElementSibling.prepend(button);
       });
     </script>
+    <style>video { max-width: 100% !important; }</style>
   </body>
 </html>