There is not enough contrast for me. I'm used to seeing this on other sites, but this is the first time I've had this problem with the Delta app. If I didn't KNOW to click on certain spaces, I'd never guess to do it with what I can currently see. I know that I have color contrast issues. That's on me, but it would be nice if developers took into account that such problems exist and offer an alternative - esp on a transportation app.