Why both container red and yellow are showing over box container. Please tell.

Question

https://code.sololearn.com/W87J1u6w8gXR/?ref=app

Answer 1

In Stylesheet .box should have z-index: 1;

Not 100px, should fix it
https://code.sololearn.com/WbunHrRnVRDx/?ref=app

Answer 2

Thanks 😌😌