How to make animation on tilde in zero block?

Question

Animation

How to make just such an animation of the smooth appearance of the background


as in the screenshot

Answer 1

Cheers, I'm glad you appreciated it :)))))))

Answer 2

not 100 percent, but it looks very similar if you make two blocks - yellow (bottom location) and white. Apply the following animation to white - Start - on Hoover and then Step 1 - set up as in the screenshot