Navigation Test Page
Test 1: Reference Container
This div uses: mx-auto w-[90%] max-w-5xl
Test 2: Viewport Info
Window Width: px
Document Width: px
Body Width: px
Scrollbar Width: px
Test 3: Header Styles
Test 4: Width Comparison
mx-auto w-[90%] max-w-5xl
mx-auto w-full max-w-5xl
mx-auto container (Tailwind)