Adjust image height

[regentstreet]

Hi, there! Thanks for your kindness btw. :D

After updated ver 1.7, there are Two things - HEIGHT and IFRAME - are not auto-resized well yet.

e.g.1. HEIGHT

I don't know the code at all, but I Do really want to use this theme,
So I have been searched Google for the right code to this lovely theme for almost one full day until now, and I collected some codes and combined them like this at last.

.entry-content img, img.size-full { width: 100% !important; height:auto; }

(of course, i don't know what '!important;' means, haha. can we delete it? or not??)

When I put that code to 'Additional CSS' of this theme, it looks like working to the height also.

e.g.2. iFrame

If I put this 'iFrame link' code to the post by TXT, it doesn't auto-resized. :S

<iframe src="https://freesound.org/embed/sound/iframe/511618/simple/large/" width="920" height="245" frameborder="0" scrolling="no"></iframe>

or

<iframe frameborder="0" scrolling="no" src="https://freesound.org/embed/sound/iframe/511618/simple/large/" width="920" height="245"></iframe>

whatever...

I don't know how to fix it, of course. :S

... When you do the next update, if you don't mind, solve these problems, please.
Thank you beforehand. :)