docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합
이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영. - Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들 (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거. - Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/ Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/ Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이 존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존). - Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/ JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동. - 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리. - Topic_Programming 최종 문서 수: 2784 → 3985.
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Antigravity Agent
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id: css-flexbox-align-items
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title: "CSS Flexbox Align Items"
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category: "Frontend"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["align-items", "align-content", "flexbox cross-axis alignment", "vertical flex alignment", "flexbox centering"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.89
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created_at: 2026-06-23
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updated_at: 2026-06-23
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review_reason: ""
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merge_history: []
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tags: ["css", "web", "frontend", "w3schools", "flexbox", "align-items", "align-content"]
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raw_sources: ["https://www.w3schools.com/css/css3_flexbox_container_align.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Flexbox Align Items]]
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## 🎯 한 줄 통찰 (One-line insight)
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`align-items` manages vertical alignment of flex items along the cross-axis, while `align-content` aligns wrapped flex lines; combining `justify-content: center` with `align-items: center` produces true centering. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`align-items` = cross-axis alignment** — controls vertical alignment of flex items along the cross-axis. [S1]
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- **`align-content` = line alignment** — aligns the flex lines, and only has effect when flex items wrap onto multiple lines. [S1]
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- **True centering** — set both `justify-content` and `align-items` to `center`. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Height is required to see effect** — the cross-axis examples set a `height` on the container so vertical alignment is observable. [S1]
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- **`align-content` needs `flex-wrap: wrap`** — line alignment only matters once items wrap onto multiple lines. [S1]
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## 📖 세부 내용 (Details)
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**The align-items Property**
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The `align-items` property manages vertical alignment of flex items along the cross-axis. Available values are `normal` (default), `stretch`, `center`, `flex-start`, `flex-end`, and `baseline`. [S1]
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The `center` value aligns the flex items in the middle of the container. [S1]
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```css
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.flex-container {
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display: flex;
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height: 200px;
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align-items: center;
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}
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```
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The `flex-start` value aligns the flex items at the top of the container. [S1]
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```css
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.flex-container {
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display: flex;
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height: 200px;
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align-items: flex-start;
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}
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```
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The `flex-end` value aligns the flex items at the bottom of the container. [S1]
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```css
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.flex-container {
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display: flex;
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height: 200px;
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align-items: flex-end;
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}
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```
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The `stretch` value stretches the flex items to fill the container (this is equal to `normal`, which is default). [S1]
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```css
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.flex-container {
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display: flex;
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height: 200px;
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align-items: stretch;
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}
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```
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**The align-content Property**
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The `align-content` property aligns the flex lines. It only has effect when flex items wrap onto multiple lines. Available values are `stretch` (default), `center`, `flex-start`, `flex-end`, `space-between`, `space-around`, and `space-evenly`. [S1]
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With `center`, the flex lines are packed toward the center of the container. [S1]
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```css
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.flex-container {
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display: flex;
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height: 400px;
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flex-wrap: wrap;
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align-content: center;
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}
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```
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With `space-between`, the space between the flex lines are equal. [S1]
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```css
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.flex-container {
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display: flex;
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height: 400px;
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flex-wrap: wrap;
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align-content: space-between;
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}
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```
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**True Centering with Flexbox**
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To achieve true centering, set both the `justify-content` and the `align-items` properties to `center`. [S1]
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```css
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.flex-container {
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display: flex;
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height: 400px;
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justify-content: center;
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align-items: center;
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}
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```
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own examples apply each value to a `.flex-container` with a fixed `height`, plus a combined centering example. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Center flex items on both axes (language: CSS):
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```css
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.flex-container {
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display: flex;
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height: 400px;
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justify-content: center;
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align-items: center;
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}
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```
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## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
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- **`align-items`** — aligns individual flex items along the cross-axis; works on single-line layouts. [S1]
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- **`align-content`** — aligns whole flex lines and only has effect when items wrap onto multiple lines (requires `flex-wrap: wrap`). [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source.
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.89
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[CSS Tutorial]]
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- **관련 개념:** [[CSS Flexbox Justify Content]], [[CSS Flex Items]], [[CSS Flexbox Responsive]]
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- **참조 맥락:** Referenced whenever aligning flex items vertically (cross-axis) or centering content within a flex container.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Flexbox Align Items — https://www.w3schools.com/css/css3_flexbox_container_align.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Flexbox Align Items" page (Astra wiki-curation, P-Reinforce v3.1 format).
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