My bad luck

Love it and I use it regularly to review train topics. I would recommend upgrading it to be compatible with iOS 13 as it’s currently hard to navigate between sections within a certain topic using the buttons at the bottom as they don’t show clearly on my iPhone 11. When trying to move to treatment after reading the facts section, I can barely see the Word “treatment” at the very far bottom which makes pressing it hard and the device doesn’t respond from the first time. Thank you and I appreciate your efforts. Thumbs up!