diff --git a/src/scss/editor/index.scss b/src/scss/editor/index.scss
index d77fa77..46e532f 100644
--- a/src/scss/editor/index.scss
+++ b/src/scss/editor/index.scss
@@ -78,7 +78,8 @@ button {
 }
 
 .output-html {
-  width: 100%;
+  // set a fixed size so that responsive styles won't be applied in the iframe
+  width: 801px;
   height: 100%;
 }