🧠 Section A · Concept Check ● BEGINNER 4 × 1 = 4
🧮 Section B · Problem Solving ● INTERMEDIATE 2 + 3×3 = 11
5padding: 10px 20px means 10 top/bottom, 20 .
6box-sizing: -box simplifies sizing.
🚀 Section C · Challenge ● CHALLENGE 5
✂ answer key — fold or cut before handing out
1-A 2-A 3-A 4-A | 5 left/right 6 border 7 = padding:16px; border:1px solid #ccc; margin-bottom:20px; 8 = padding = inside the border; margin = outside it 9 = Widths mean what you say - padding/border included | 10 = width:600px; margin:0 auto;