The them itself may use scripts that conflict with the iFrame. If it has options for that or you are able to customize the WP stuff, try a fixed width layout.
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I'm using Muse 2017.01.11 and have embedded a blog using an iframe in the 'add html' feature in the object menu:
<iframe src="https://webcontentwriterbrisbane.com.au/webcontentwriterblog" width="100%" height="1500" marginwidth="0" frameborder="no"></iframe>
width="100%" is not a valid entry for an iframe... you get get a default min by the browser or nothing at all.
work around I offen use is stretch to browser but the iframe Pavel Homeriki posted works well in my sites too
Well that's ridiculous because that iframe, exactly as it is, came from Terry White, Adobe's own Muse guru! I'm beginning to think Muse is unreliable to say the least.
Sent from my iPhone
Terry White is presentations guru, but not Muse guru