What is the correct way to make a message vertically centered in my box using FlexBox?

Question

Flexbox

Good afternoon.
Please tell me how to make the picture stick (shift) to the very bottom in the central block, and in the remaining space the text is located in the center vertically?
I understand that a picture is worth 1000 words, so I'm attaching a link to html/css. At the moment, I did it very clumsily, but you can understand the essence as it should be.
https://jsfiddle.net/sjbbrz5k/
Thank you for your attention