Social buttons are only grey (no colors)

Scriptless is set up with its own CSS to be specific, but not so specific that it is difficult to override. It sounds like your theme (or another plugin) likely has a rule in place which is more specific which is overriding this plugin’s styles. If you can provide a link of an affected post or page, I may be able to offer specific guidance, but that’s where I would look.

I’ve activated the plugin temporarily and it looks like this: https://www.camina.pl/strategia-i-rozwoj/etapy-rozwoju-firmy-i-najwazniejsza-rada-dla-kazdego-z-nich/

There is a gradient applied to your site’s a.button elements, which is being added to the sharing buttons. You could add this rule to your theme’s stylesheet, or to the additional CSS panel in the customizer, and that should fix it:

.scriptlesssocialsharing__buttons a.button {
    background-image: none;
}

Hope that helps!

Thank you very much, Robin for you kind help.
But I am not a programmer. Have no idea how to add this code and do not want to damage anything ??
I can see an “additional CSS” section in the view settings, however not sure where to add this, beginning, the end or… Probably will not try by myself.
If I will find somebody more experienced, will ask for help with that. Your answer will be of much help then.