Dear @Meike
use CUSTOM CSS:
https://www.w3schools.com/cssref/css3_pr_transform.asp
Are you familiar with CSS and a bit of jQuery? If not I would recommend to have a look into some tutorials at Codeacademy https://www.codecademy.com/.
It is for free for the basics. The effect you are trying to achieve requires some knowledge and brainpower :-)
Best!
Marius