Hi, @igor44414 (igor s) 
I'm glad that you've solved the problem you had with the "Human" theme. I've never tried that theme, but I've found the following topic, here in the "Ubuntu MATE Community", started by the long time user @ugnvs (Eugene), on 13th June 2019, that may also be interesting to you:
Let me quote here that @ugnvs 's post in its entirety, for easier reference:
"Dear All,
TraditionalHumanized theme is gtk2, gtk3 theme for Ubuntu Mate 18.04. It was derived from well-polished TraditionalOk Theme. No bicycles reinvented.
The essence of TraditionalHumanized theme is that it reproduces classic Human gtk2 theme colors, uses Humanity icon set and features dimmed background colors. It does not kill eyes.
Hopefully it could help to lesser frustrations on the absence of beloved old-fashioned GTK2 Human theme in the up-to date Ubuntu Mate 18.04. At least it did for me.
Please visit https://www.mate-look.org/p/1309630/ to evaluate TraditionalHumanized theme. Do not forget to install Humanity icon set before turning TraditionalHumanized theme on.
Regards,
Gene "
The linked web page in that topic is "Human GTK3 - TraditionalHumanized Themes - /s/Mate" - https://www.mate-look.org/p/1309630/ :
I hope this is interesting / useful