Help with wordpress

Hi, I want to make my website's menu (in mobile version) just like it is in the desktop version. Take a look In desktop version it's inline but in mobile its normal drop down menu which is not very user-friendly so I want to do it like in this article –

But i can't understand how so is possible that you can try to give me css if it's possible just by custom CSS. I do understand since you do not provide direct support for the theme you will have boundaries but see if can help :slight_smile: