Merge pull request #2975 from meyerco/bug-fix-2849-background-image-is-not-working-properly Fixes #2849

handle case when url is not a base64 format .

src/style_manager/model/Property.js

@@ -202,7 +202,8 @@ const Property = Backbone.Model.extend(
       }
 
       if (fn && hasValue) {
-        value = `${fn}(${value})`;
+        const fnParameter = fn === 'url' ? `'${value}'` : value;
+        value = `${fn}(${fnParameter})`;
       }
 
       if (hasValue && this.get('important')) {