Social Sharing Button

Hi !
Buttons social rushing on the right of the post , if this is a slide overlap the slide itself. They go too high .
I would like to know how I can stop the rise of the buttons before the slide .
I would also like to know how I can resize the slide itself. It has an aspect ratio of 16 : 9 and I would had a porporzione of 4 : 3 . thanks