Hi everyone, can you help me...

...with this question about Steemit posts? How do you ensure that when you put in an image, for example from www.pexels.com, or www.pixabay.com, which are the free image sites I usually use, from taking up all the horizontal space on your post? 

Here's another, related question...

How do you prevent your main picture that shows up to the left of your title in people's feeds to also who up at the top of your post when they open it up?