CSS, with the layout showing

Forty steps through flexbox, twenty-two builds that fail unless several concepts are right at once, and the famous wtfs underneath — margin collapsing, stacking contexts, and the invisible wall inside every flex item. This is the one subject where the output IS the picture, so every problem is rendered rather than described.

Problems

49 problems

All topics Advanced Alignment Distributing space Gap Main axis vs cross axis Making a flex container Order Sizing The famous WTFs The min-width:auto floor Wrapping and the align-content trap

Easy Medium Hard|Teaching step Predict the render Build it Explain the wtf

#	title	topic	type	difficulty
1	display: flex changes the children, not the box	Making a flex container	Teaching step	Easy
2	flex-direction: column swaps which axis is which	Main axis vs cross axis	Teaching step	Easy
3	justify-content is the main axis, align-items is the cross axis	Alignment	Teaching step	Easy
4	align-items: stretch is the default	Alignment	Teaching step	Easy
5	align-self overrides the container	Alignment	Teaching step	Easy
6	justify-content distributes free space — and sometimes there is none	Distributing space	Teaching step	Easy
7	flex-grow distributes the surplus, not the container	Sizing	Teaching step	Easy
8	flex-shrink: 0 is defensive CSS	Sizing	Teaching step	Easy
9	gap spaces items without touching them	Gap	Teaching step	Easy
10	flex-wrap: wrap turns one line into many	Wrapping and the align-content trap	Teaching step	Easy
11	The mystery gap under an image	The famous WTFs	Explain the wtf	Easy
12	The whitespace between inline-block elements	The famous WTFs	Explain the wtf	Easy
13	Centre the brand mark in the masthead	Alignment	Build it	Easy
14	Centre the hero card — in a container that runs downwards	Main axis vs cross axis	Build it	Easy
15	Centre the unread count inside its pill	Alignment	Build it	Easy
16	Centre the empty-state message in the results panel	Alignment	Build it	Easy
17	Centre the glyph in the round action button	Alignment	Build it	Easy
18	Sit the editor tools in the middle of the rail	Alignment	Build it	Easy
19	Float the pinned tag to the front of the list	Order	Build it	Easy
20	Hold the terminal output at the bottom — in the order it was written	Distributing space	Build it	Easy
21	Newest activity at the top, list still hugging the top	Main axis vs cross axis	Build it	Easy
22	Flip your own chat messages to the right	Main axis vs cross axis	Build it	Easy
23	Reverse the wizard steps — and keep them on the left	Main axis vs cross axis	Build it	Easy
24	Drop the chips so they stack up from the floor	Main axis vs cross axis	Build it	Easy
25	The same dialog footer, and now they have to sit at the bottom	Alignment	Build it	Easy
26	Send the destructive button to the far end of the toolbar	Distributing space	Build it	Easy
27	Pin both team badges to the edges and centre the clock	Distributing space	Build it	Easy
28	Push the close button to the far edge of the modal header	Distributing space	Build it	Easy
29	Move the whole dialog button row to the trailing edge	Distributing space	Build it	Easy
30	Render Cancel before Save without touching the markup	Order	Build it	Easy

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44 of 87 catalogue topics are authored, with 37 drills rehearsing them. Every one of them is judged: each carries a starter that has been shown to fail, at least two different correct answers that have been shown to pass, and a set of near-misses and cheats that have been shown to be caught. Nothing reaches this list until all of that holds.