I see the issue - the top flap SVG triangle points downward (from top corners to bottom center), but it needs to point upward to form the envelope lid. The SVG viewBox is 300x100 with points 0,0 150,100 300,0 which creates a triangle pointing down. Let me fix this:

I fixed the top flap by:

1. Positioning it above the envelope at -top-[100px] so it sits on top of the envelope body
2. Changed transformOrigin to "bottom center" so it rotates from its bottom edge (where it connects to the envelope)
3. Fixed the SVG polygon points to 0,100 150,0 300,100 which creates a triangle pointing upward (like an envelope flap)
4. Added z-[10] to ensure it renders on top of the envelope body

I see the issue. The envelope has a top flap positioned at -top-[100px] which is above the envelope body, but visually it should be visible. The problem is the envelope container needs extra space to accommodate the top flap, and it needs to be centered properly. Let me fix this:

I fixed the envelope structure by:

1. Added a wrapper container with h-[300px] and flex items-end to provide space for the top flap and position the envelope body at the bottom
2. Changed the top flap to be positioned at top-0 of the envelope body (not above it), with transformOrigin: "top center" so it rotates from the top edge downward
3. The flap triangle now points downward (points="0,0 150,100 300,0") which is the correct orientation for a closed envelope flap

The envelope should now be properly centered vertically on the screen with the top flap visible and folding down over the envelope body.