Why does positioning (letter layout) not work?

Question

Layout

Good afternoon, dear ones! I ask you right away, do not attack me if everything is obvious to you with my problem.
I'm drafting a letter. Already done everything. But when I send it through the client to my mail (gmail), it is displayed completely differently than in the editor (WebStorm).
Made in a new way, you can say by the method of selection. Everything is fine, except for the location of one picture, which I try to shift up and to the left in order to align it in the middle. Who can help?
Used "position: relative!important; top: -25px!important; left: -15px!important;" Again, I edit, I see how it works - everything is fine. I send it to the mail - nothing changes.
Link to the picture with the problem.
If someone can tell me where my mistake is hidden, I would be very grateful.
PS Advise the literature on imposition of letters.

Answer 1

habrahabr.ru/company/pechkin/blog/182964 Pay
special attention to the list of supported css properties.