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title

HOWTO CSS Four Columns

🎯 한 줄 통찰 (One-line insight)

Four equal columns is just width: 25% (100% ÷ 4 columns) applied to float: left children — the SAME clearfix-plus-float pattern already seen in the About Page and Equal Height recipes, confirming that "N equal float columns" always reduces to width: (100/N)% plus a ::after clearfix on the row, regardless of whether N is 2, 3, or 4. [S1]

🧠 핵심 개념 (Core concepts)

width: 25% for 4 equal columns — the float-width formula generalizes as 100% / N for N equal columns. [S1]
.row:after clearfix — required whenever floated columns are used, to prevent the row container from collapsing. [S1]
Single-breakpoint responsive collapse — @media (max-width: 600px) { .column { width: 100%; } } stacks all four columns vertically below 600px, with no intermediate 2-column step (contrast with Mixed Column Layout, which adds an intermediate breakpoint). [S1]

📖 세부 내용 (Details)

Base layout: .column { float: left; width: 25%; } .row:after { content: ""; display: table; clear: both; }. [S1]
Responsive collapse: @media screen and (max-width: 600px) { .column { width: 100%; } }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

없음 — 신규 레시피, 기존 문서와 모순되는 내용 없음.

🛠️ 적용 사례 (Applied in summary)

4개의 동일한 폭 컬럼을 만들고, 600px 미만 화면에서 전부 세로로 쌓이게 하는 예제가 원문에서 직접 제시됨. [S1]

💻 코드 패턴 (Code patterns)

Four equal float columns with a single responsive breakpoint (CSS):

.column { float: left; width: 25%; }
.row:after { content: ""; display: table; clear: both; }

@media screen and (max-width: 600px) {
  .column { width: 100%; }
}

✅ 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 Mixed Columns, HOWTO CSS Three Columns, HOWTO CSS Two Columns, HOWTO CSS Equal Height
참조 맥락: CSS Layout & Positioning 섹션.

📚 출처 (Sources)

[S1] W3Schools — How To - Four Column Layout — https://www.w3schools.com/howto/howto_css_four_columns.asp

📝 변경 이력 (Change history)

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

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