test -- print scrollItemToMidpoint function log

src/js/01-nav.js

@@ -160,6 +160,10 @@
     var rect = panel.getBoundingClientRect()
     var effectiveHeight = rect.height
     var navStyle = window.getComputedStyle(nav)
+    console.log('panel height >>>>> ', effectiveHeight)
+    console.log('el hight >>>>> ', el.getBoundingClientRect().height)
+    console.log('calculated top >>>>> ',
+      Math.max(0, (el.getBoundingClientRect().height - effectiveHeight) * 0.5 + el.offsetTop))
     if (navStyle.position === 'sticky') effectiveHeight -= rect.top - parseFloat(navStyle.top)
     panel.scrollTop = Math.max(0, (el.getBoundingClientRect().height - effectiveHeight) * 0.5 + el.offsetTop)
   }