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10_Wiki/Dev/Topic_HOWTO/HOWTO_CSS_Block_Buttons.md

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+---
+id: howto-css-block-buttons
+title: "How To - Full Width (Block) Buttons"
+category: "Web_Recipes"
+status: "draft"
+verification_status: "conceptual"
+canonical_id: ""
+aliases: ["full width button CSS"]
+duplicate_of: ""
+source_trust_level: "B"
+confidence_score: 0.78
+created_at: 2026-07-04
+updated_at: 2026-07-04
+review_reason: ""
+merge_history: []
+tags: ["howto", "css", "w3schools", "buttons"]
+raw_sources: ["https://www.w3schools.com/howto/howto_css_block_buttons.asp"]
+applied_in: []
+github_commit: ""
+---
+
+# [[HOWTO CSS Block Buttons]]
+
+## 🎯 한 줄 통찰 (One-line insight)
+A `<button>` is inline-block by default, so `width: 100%` alone does nothing until `display: block` is also set — this is the same "unconstrained-vs-constrained-width" dependency seen in `[[HOWTO CSS Center Website]]`'s `margin: auto`, just from the opposite direction: there, the element needed a WIDTH LIMIT to leave room for centering; here, the button needs its DISPLAY TYPE changed before a width percentage can have any visual effect on an inherently content-sized element. [S1]
+
+## 🧠 핵심 개념 (Core concepts)
+- **`display: block` + `width: 100%`** — both required together; a button (default `inline-block`) won't stretch to `100%` width without first becoming a block-level element. [S1]
+
+## 📖 세부 내용 (Details)
+- `.block { display: block; width: 100%; border: none; padding: 14px 28px; text-align: center; }`. [S1]
+
+## ⚖️ 모순 및 업데이트 (Contradictions & updates)
+없음 — 신규 레시피, 기존 문서와 모순되는 내용 없음.
+
+## 🛠️ 적용 사례 (Applied in summary)
+현재 발견된 실제 적용 사례가 없습니다 — 컨테이너 전체 폭을 차지하는 버튼 하나의 최소 예제가 원문에서 제시됨. [S1]
+
+## 💻 코드 패턴 (Code patterns)
+Block button — requires both display:block AND width:100% (CSS):
+```css
+.block {
+  display: block;
+  width: 100%;
+  border: none;
+  padding: 14px 28px;
+  text-align: center;
+}
+```
+
+## ✅ 검증 상태 및 신뢰도
+- **상태:** draft
+- **검증 단계:** conceptual
+- **출처 신뢰도:** B (W3Schools — widely used educational reference)
+- **신뢰 점수:** 0.78
+- **중복 검사 결과:** 신규 생성 (New discovery)
+
+## 🔗 지식 그래프 (Knowledge Graph)
+- **상위/루트:** [[W3Schools HOW TO]]
+- **관련 개념:** [[HOWTO CSS Alert Buttons]], [[HOWTO CSS Button Group]]
+- **참조 맥락:** CSS Buttons 섹션.
+
+## 📚 출처 (Sources)
+- [S1] W3Schools — How To - Full Width (Block) Buttons — https://www.w3schools.com/howto/howto_css_block_buttons.asp
+
+## 📝 변경 이력 (Change history)
+- 2026-07-04: Initial draft synthesized from the W3Schools "How To - Full Width (Block) Buttons" recipe (Astra wiki-curation, P-Reinforce v3.1 format).