Some things have changed after update to catch-kathmandu-pro.5.4.1

I have updated my theme to catch-kathmandu-pro.5.4.1 and now some things have changed. - all the buttons have changed to grey, I want them in another colour - the menu <span class="Y2IQFc" lang="en">doesn't look good on mobile devices because it has changed to grey, I'd like to put then green.</span> Thank you