Images way too big, caption not in line


unfortunately many images that I upload for the posts come out either too big (esp. the header image) or the captions are not in line on the website and in the emails. E.g.:

I’m using Substation theme and Ghost Pro. I’ve already tinkered with Code Injection and added the following code, but it is not satisfactory.

.kg-image { width: 90%; max-height: 90vh; }

Any help is appreciated.

Without any links to your website or some source code there is not much anyone can do to help you.

Also, since Substation is a commercial theme, it might be useful to mention whether you have contacted for any support.