Embed webpage using Embed block

Hi

I tried embedding a webpage (Walnut simulation) using the Embed block. It is set to full width in the settings. The webpage loads fine but gets cut off on the right side. Here are the settings I am using:

<iframe allowfullscreen="true" frameborder="0" height="315" src="https://app.teamwalnut.com/player/?demoId=f7c71d5a-5e9d-4114-a56e-624b4c34506a&showGuide=true&showGuidesToolbar=false&showHotspots=true&isEmbed=false" width="420"></iframe> 

Is there a way to resolve this? I tried changing the width parameter but that doesn't do anything.