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The embedded css properties can be overridden with an important statement. ImageGallery is not a module. It is a ContentView based control. Generally you can download the external template for this control and modify its layout. Then you can map the template
to ImageGallery control using its ItemListTemplatePath property.You can easily create a custom css class and integrate it with ImageGallery control. You can add your css to a template css or use CssFileLink contorl and its FileName property to set the location to your custom css file.
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