What needs to be done so that when scrolling up from the mobile, the picture stops twitching?

Question

css

Works fine on the big screen.
But when you view it from a mobile phone , the top picture starts to twitch. Because of what it might be. Yesterday they suggested, but either I misunderstood, or I did it wrong. When viewed from a mobile, the top picture still jumps. HERE - testing.internet-24.ru

Answer 1

I will assume that such jumps occur due to the size and weight of the image. Try for small resolutions to load a smaller image via media expressions.