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title

HOWTO CSS Center Website

🎯 한 줄 통찰 (One-line insight)

margin: auto only centers a block horizontally if the element has an EXPLICIT width (here via max-width) — an unconstrained block always stretches to fill its parent, leaving no leftover space for the browser to distribute as equal left/right margins, which is the entire reason this recipe pairs max-width: 500px with margin: auto rather than using either alone; this is the simplest of all the centering recipes in this cookbook because it needs neither position, transform, nor Flexbox — just a width constraint plus auto margins. [S1]

🧠 핵심 개념 (Core concepts)

margin: auto requires a constrained width — auto margins only distribute leftover horizontal space; a full-width block has none to distribute. [S1]
max-width instead of width — allows the content wrapper to shrink on narrow viewports (spanning the full page below the breakpoint) while capping its width on wide screens. [S1]
No positioning/transform/flexbox needed — the simplest technique in this cookbook's centering family, applicable to whole-page content wrappers rather than individual elements. [S1]

📖 세부 내용 (Details)

.content { max-width: 500px; margin: auto; } applied to a wrapper <div> directly inside <body>. [S1]
Below 500px viewport width, the content spans the full page (since max-width stops constraining once the viewport is narrower than it). [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

없음 — 신규 레시피, 기존 문서와 모순되는 내용 없음.

🛠️ 적용 사례 (Applied in summary)

페이지 콘텐츠를 500px 폭으로 제한하고 margin:auto로 가로 중앙 정렬해, 500px보다 좁은 화면에서는 전체 폭을 차지하게 만드는 예제가 원문에서 직접 제시됨. [S1]

💻 코드 패턴 (Code patterns)

Centering a whole page's content with max-width + margin:auto (CSS):

.content {
  max-width: 500px;
  margin: auto;
}

✅ 검증 상태 및 신뢰도

상태: draft
검증 단계: conceptual
출처 신뢰도: B (W3Schools — widely used educational reference)
신뢰 점수: 0.82
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: W3Schools HOW TO
관련 개념: HOWTO CSS Center Button, HOWTO CSS Full Page
참조 맥락: CSS Layout & Positioning 섹션.

📚 출처 (Sources)

[S1] W3Schools — How To - Center Website — https://www.w3schools.com/howto/howto_css_center_website.asp

📝 변경 이력 (Change history)

2026-07-04: Initial draft synthesized from the W3Schools "How To - Center Website" recipe (Astra wiki-curation, P-Reinforce v3.1 format).

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