I am using selenium to test our software, but I have run into a problem.
There is a button like this :
<button data-action="show-more" class="btn btn-link btn-invisible more padded">Viac potenciálne zmluvy...</button>
The first part of your selector is "btn" which is a class so it should be ".btn". I would go one step further and add the tag name to the front to make it a little more specific which would make the selector: