Michael Czechowski
61acd692f4
Replace copy-pasteable CSS declarations in all 6 flexbox lesson tasks with outcome-oriented descriptions. Update validation error messages to hint at properties without revealing exact declarations. Add regex validation for flexbox-6 to accept both flex: 1 and flex-grow: 1.
136 lines
8.5 KiB
JSON
136 lines
8.5 KiB
JSON
{
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"$schema": "../schemas/code-crispies-module-schema.json",
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"id": "flexbox",
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"title": "CSS Flexbox",
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"description": "Master the flexible box layout model for modern responsive designs",
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"difficulty": "intermediate",
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"lessons": [
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{
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"id": "flexbox-1",
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"title": "Container",
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"description": "Before flexbox, creating even simple layouts required floats, positioning hacks, or table-based layouts. Flexbox (Flexible Box Layout) revolutionized CSS by providing a one-dimensional layout system designed specifically for distributing space and aligning content.<br><br><strong>How it works:</strong> When you set <kbd>display: flex</kbd> on an element, it becomes a <em>flex container</em>. Its direct children automatically become <em>flex items</em> that flow along a main axis (horizontal by default). This single property transforms stacked block elements into a horizontal row.<br><br><strong>The two axes:</strong><br>• <em>Main axis</em> – The primary direction items flow (row = left→right)<br>• <em>Cross axis</em> – Perpendicular to main (row = top→bottom)<br><br><pre>.nav {\n display: flex;\n}</pre>",
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"task": "The navigation links are stacking vertically. Make them display side by side in a horizontal row.",
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"previewHTML": "<nav class=\"nav\"><a href=\"#\">Home</a><a href=\"#\">Products</a><a href=\"#\">About</a><a href=\"#\">Contact</a></nav>",
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"previewBaseCSS": "body { font-family: system-ui, sans-serif; margin: 0; } .nav { background: #1a1a2e; padding: 1rem; } .nav a { color: white; text-decoration: none; padding: 8px 1rem; border-radius: 4px; } .nav a:hover { background: rgba(255,255,255,0.1); }",
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"sandboxCSS": "",
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"codePrefix": ".nav {\n ",
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"initialCode": "",
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"codeSuffix": "\n}",
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"solution": "display: flex;",
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"previewContainer": "preview-area",
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"validations": [
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{
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"type": "property_value",
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"value": { "property": "display", "expected": "flex" },
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"message": "Try changing the display mode to create a flex container"
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}
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]
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},
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{
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"id": "flexbox-2",
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"title": "Gap",
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"description": "The <kbd>gap</kbd> property adds consistent spacing between flex items without needing margins. It only creates space between items, not around the edges.",
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"task": "The navigation links are crammed together with no breathing room. Add 1rem of spacing between them.",
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"previewHTML": "<nav class=\"nav\"><a href=\"#\">Home</a><a href=\"#\">Products</a><a href=\"#\">About</a><a href=\"#\">Contact</a></nav>",
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"previewBaseCSS": "body { font-family: system-ui, sans-serif; margin: 0; } .nav { background: #1a1a2e; padding: 1rem; display: flex; } .nav a { color: white; text-decoration: none; padding: 8px 1rem; border-radius: 4px; background: rgba(255,255,255,0.1); }",
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"sandboxCSS": "",
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"codePrefix": ".nav {\n ",
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"initialCode": "",
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"codeSuffix": "\n}",
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"solution": "gap: 1rem;",
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"previewContainer": "preview-area",
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"validations": [
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{
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"type": "property_value",
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"value": { "property": "gap", "expected": "1rem" },
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"message": "Use the property that adds spacing between flex items"
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}
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]
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},
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{
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"id": "flexbox-3",
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"title": "Justify Content",
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"description": "<kbd>justify-content</kbd> distributes items along the main axis. Common values:<br>• <kbd>flex-start</kbd> – pack items at the start<br>• <kbd>flex-end</kbd> – pack at the end<br>• <kbd>center</kbd> – center items<br>• <kbd>space-between</kbd> – equal space between items<br>• <kbd>space-around</kbd> – equal space around items",
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"task": "The Login button should sit on the far right, with the other links staying on the left. Distribute the space between them.",
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"previewHTML": "<nav class=\"nav\"><div class=\"links\"><a href=\"#\">Home</a><a href=\"#\">Products</a><a href=\"#\">About</a></div><a href=\"#\" class=\"login\">Login</a></nav>",
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"previewBaseCSS": "body { font-family: system-ui, sans-serif; margin: 0; } .nav { background: #1a1a2e; padding: 1rem; display: flex; } .links { display: flex; gap: 8px; } .nav a { color: white; text-decoration: none; padding: 8px 1rem; border-radius: 4px; } .nav a:hover { background: rgba(255,255,255,0.1); } .login { background: steelblue; }",
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"sandboxCSS": "",
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"codePrefix": ".nav {\n ",
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"initialCode": "",
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"codeSuffix": "\n}",
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"solution": "justify-content: space-between;",
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"previewContainer": "preview-area",
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"validations": [
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{
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"type": "property_value",
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"value": { "property": "justify-content", "expected": "space-between" },
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"message": "Use the property that distributes items along the main axis"
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}
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]
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},
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{
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"id": "flexbox-4",
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"title": "Align Items",
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"description": "<kbd>align-items</kbd> controls alignment on the cross axis (vertical when flex-direction is row). Values include:<br>• <kbd>stretch</kbd> – stretch to fill (default)<br>• <kbd>flex-start</kbd> – align to top<br>• <kbd>flex-end</kbd> – align to bottom<br>• <kbd>center</kbd> – center vertically",
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"task": "The logo and nav links sit at different heights. Center them vertically so they line up.",
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"previewHTML": "<header class=\"header\"><div class=\"logo\">ACME</div><nav><a href=\"#\">Products</a><a href=\"#\">Pricing</a><a href=\"#\">Docs</a></nav></header>",
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"previewBaseCSS": "body { font-family: system-ui, sans-serif; margin: 0; } .header { background: white; padding: 1rem 2rem; display: flex; justify-content: space-between; border-bottom: 1px solid #eee; } .logo { font-size: 1.5rem; font-weight: bold; color: steelblue; } nav { display: flex; gap: 1rem; } nav a { color: #333; text-decoration: none; font-size: 0.9rem; }",
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"sandboxCSS": "",
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"codePrefix": ".header {\n ",
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"initialCode": "",
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"codeSuffix": "\n}",
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"solution": "align-items: center;",
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"previewContainer": "preview-area",
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"validations": [
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{
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"type": "property_value",
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"value": { "property": "align-items", "expected": "center" },
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"message": "Use the property that controls cross-axis alignment"
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}
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]
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},
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{
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"id": "flexbox-5",
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"title": "Flex Wrap",
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"description": "By default, flex items squeeze onto one line. <kbd>flex-wrap: wrap</kbd> allows items to flow onto multiple lines when they run out of space.",
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"task": "The cards overflow the container instead of fitting within it. Allow the items to flow onto new rows when they run out of space.",
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"previewHTML": "<div class=\"cards\"><article class=\"card\">Card 1</article><article class=\"card\">Card 2</article><article class=\"card\">Card 3</article><article class=\"card\">Card 4</article><article class=\"card\">Card 5</article><article class=\"card\">Card 6</article></div>",
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"previewBaseCSS": "body { font-family: system-ui, sans-serif; padding: 1rem; background: #f5f5f5; } .cards { display: flex; gap: 1rem; } .card { background: white; padding: 2rem; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); min-width: 120px; text-align: center; }",
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"sandboxCSS": "",
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"codePrefix": ".cards {\n ",
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"initialCode": "",
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"codeSuffix": "\n}",
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"solution": "flex-wrap: wrap;",
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"previewContainer": "preview-area",
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"validations": [
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{
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"type": "property_value",
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"value": { "property": "flex-wrap", "expected": "wrap" },
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"message": "Use the property that allows flex items to wrap onto new lines"
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}
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]
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},
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{
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"id": "flexbox-6",
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"title": "Flex Grow",
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"description": "The <kbd>flex</kbd> property on items controls how they grow and shrink. <kbd>flex: 1</kbd> makes an item grow to fill available space. Multiple items with <kbd>flex: 1</kbd> share space equally.",
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"task": "The search input is too narrow. Make it stretch to fill all the remaining space in the toolbar.",
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"previewHTML": "<div class=\"toolbar\"><input class=\"search\" type=\"text\" placeholder=\"Search...\"><button class=\"btn\">Search</button><button class=\"btn\">Filters</button></div>",
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"previewBaseCSS": "body { font-family: system-ui, sans-serif; padding: 1rem; } .toolbar { display: flex; gap: 8px; padding: 1rem; background: #f5f5f5; border-radius: 8px; } .search { padding: 8px 1rem; border: 1px solid #ddd; border-radius: 4px; font-size: 1rem; } .btn { padding: 8px 1rem; background: steelblue; color: white; border: none; border-radius: 4px; cursor: pointer; }",
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"sandboxCSS": "",
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"codePrefix": ".search {\n ",
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"initialCode": "",
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"codeSuffix": "\n}",
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"solution": "flex: 1;",
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"previewContainer": "preview-area",
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"validations": [
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{
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"type": "regex",
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"value": "(flex\\s*:\\s*1|flex-grow\\s*:\\s*1)",
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"message": "Use the property that makes a flex item grow to fill available space"
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}
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]
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}
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]
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}
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