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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---
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id: css-center-align
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title: "CSS Center Align"
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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: ["center align", "center a div", "flexbox centering", "horizontal and vertical center", "CSS centering methods"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.86
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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", "alignment", "flexbox"]
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raw_sources: ["https://www.w3schools.com/css/css_align.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Center Align]]
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## 🎯 한 줄 통찰 (One-line insight)
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CSS can center elements horizontally, vertically, or both with several methods depending on the element type — and Flexbox is the most modern and recommended method for centering content both horizontally and vertically. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Multiple methods, choose by element type** — with CSS you can center elements (horizontally, vertically, or both) with several methods, depending on the type of element. [S1]
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- **Horizontal options** — `margin: auto` for block elements, `text-align: center` for text, and `float` or `position` for left/right alignment. [S1]
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- **Vertical options** — Flexbox with `align-items: center`, Grid with `place-items: center`, or Position plus Transform for elements of unknown dimensions. [S1]
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- **Recommended method** — Flexbox is the most modern and recommended method for centering content both horizontally and vertically. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Flexbox centering pattern** — on a container, `display: flex` + `justify-content: center` + `align-items: center` centers a child on both axes. [S1]
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- **Method-by-need selection** — pick the centering technique based on whether you are centering a block, text, an image, or an element of unknown size. [S1]
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## 📖 세부 내용 (Details)
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**Centering elements in CSS**
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With CSS, you can center elements (horizontally, vertically, or both) with several methods, depending on the type of element. [S1]
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**Center a div element using flexbox** [S1]
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```css
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.center {
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display: flex;
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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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**Horizontal alignment methods**
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For horizontal alignment, options include using `margin: auto` for block elements, `text-align: center` for text, and `float` or `position` for left/right alignment. [S1]
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**Vertical alignment methods**
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For vertical alignment, the page recommends modern techniques: Flexbox with `align-items: center`, Grid with `place-items: center`, or Position plus Transform for elements of unknown dimensions. [S1]
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**Key tip**
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Flexbox is the most modern and recommended method for centering content both horizontally and vertically. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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The page's own applied example is centering a `div` both horizontally and vertically with Flexbox. The horizontal and vertical method lists point to the dedicated [[CSS Horizontal Align]] and [[CSS Vertical Align]] pages for full examples. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Flexbox both-axis centering (language: CSS):
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```css
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.center {
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display: flex;
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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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- **Choosing a centering method** — `margin: auto` (block), `text-align: center` (text), `float`/`position` (directional), Flexbox (`align-items: center`), Grid (`place-items: center`), and Position+Transform (unknown dimensions) each suit a different element type. Flexbox is the most modern and recommended choice for centering on both axes. [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:** 0.86
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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 Horizontal Align]], [[CSS Vertical Align]], [[CSS Inline Block]], [[CSS Flexbox]]
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- **참조 맥락:** The overview entry point for any task that needs to center content on one or both axes.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Center Align — https://www.w3schools.com/css/css_align.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Center Align" page (Astra wiki-curation, P-Reinforce v3.1 format).
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