diff --git a/src/components/custom-html/ko/customHtmlEditorView.html b/src/components/custom-html/ko/customHtmlEditorView.html
index 518890632..8f499bd78 100644
--- a/src/components/custom-html/ko/customHtmlEditorView.html
+++ b/src/components/custom-html/ko/customHtmlEditorView.html
@@ -1,4 +1,4 @@
-<div class="form flex-item flex-item-grow flex flex-column" data-bind="scrollable: {}">
+<div class="form flex-item flex-item-grow flex flex-column">
     <size-editor
         params="{ features: 'width,height', allowUnits: 'px,%', sizeConfig: sizeStyleConfig, onUpdate: onSizeUpdate }">
     </size-editor>
diff --git a/src/components/custom-widget/ko/customWidgetEditorView.html b/src/components/custom-widget/ko/customWidgetEditorView.html
index ffc6f4beb..9327716de 100644
--- a/src/components/custom-widget/ko/customWidgetEditorView.html
+++ b/src/components/custom-widget/ko/customWidgetEditorView.html
@@ -1,5 +1,5 @@
 <fieldset class="form flex flex-item flex-item-grow no-overflow">
-    <div class="flex flex-column fit">
+    <div class="flex flex-column flex-item flex-item-grow">
         <div class="flex-item">
             <div class="form-group">
                 <label class="form-label">Name</label>
@@ -15,6 +15,7 @@ <h4>Custom properties</h4>
 
         <iframe class="flex-item flex-item-grow"
                 data-bind="attr: { id: instanceId, src: src, sandbox: iframeSandboxAllows }"
+                height="320"
                 frameborder="0"
         ></iframe>
     </div>