Code should be…

<p style=”border-top:3px solid #003596; margin-top:1em;”><iframe allowfullscreen=”” frameborder=”0″ height=”1000px” scrolling=”no” src=”https://aais.maps.arcgis.com/apps/webappviewer/index.html?id=3f240fd5536f4e94b4e77ed92d4d7d40″ title=”Title Placeholder” width=”100%”></iframe></p>