How to create 3D transform at 21days portfolio

Dear Community members

I would need help.
I am now learning Webflow by 21 days portfolio.
Then, I could not make 3D though I exactly try to follow the course.

Here is what I did.

  1. I put “Children Perspective” at the parent element.
  2. I applied 3D transforms to move by z axis for the children, which were overlapped by the position absolute.

The outcome was to see the 2nd color at the outside, instead of 3D transform…

Can anybody advise how to fix it to be the right 3D transform?

Best Regards, Kaylie

Here is my public share link: [LINK][1]
([how to access public share link][2])

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[2]: Webflow - Webflow 21days