Mobile first workflow + Automated tests

The project is not perfect as in the design file. On this end I would like to receive some feedback on how to improve my frontend. Also I used automated testing techniques in order to test my site. I used Java and Selenium. I would like to receive some feedback also on this end, if my test cases are clear enough and if they are sufficient. I tested the core functions of the site, if the button works and if the text from API is displayed on the page after pressing the button.

Thank in advance ! Happy codding !