2nd/10_Wiki/Topic_Programming/Topic_CSS/CSS_Flexbox_Align.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
css-flexbox-align-items	CSS Flexbox Align Items	Frontend	draft	conceptual		align-items align-content flexbox cross-axis alignment vertical flex alignment flexbox centering		B	0.89	2026-06-23	2026-06-23			css web frontend w3schools flexbox align-items align-content	https://www.w3schools.com/css/css3_flexbox_container_align.asp

CSS Flexbox Align Items

🎯 한 줄 통찰 (One-line insight)

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]

🧠 핵심 개념 (Core concepts)

• align-items = cross-axis alignment — controls vertical alignment of flex items along the cross-axis. [S1]
• align-content = line alignment — aligns the flex lines, and only has effect when flex items wrap onto multiple lines. [S1]
• True centering — set both justify-content and align-items to center. [S1]

🧩 추출된 패턴 (Extracted patterns)

• Height is required to see effect — the cross-axis examples set a height on the container so vertical alignment is observable. [S1]
• align-content needs flex-wrap: wrap — line alignment only matters once items wrap onto multiple lines. [S1]

📖 세부 내용 (Details)

The align-items Property 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]

The center value aligns the flex items in the middle of the container. [S1]

.flex-container {
  display: flex;
  height: 200px;
  align-items: center;
}

The flex-start value aligns the flex items at the top of the container. [S1]

.flex-container {
  display: flex;
  height: 200px;
  align-items: flex-start;
}

The flex-end value aligns the flex items at the bottom of the container. [S1]

.flex-container {
  display: flex;
  height: 200px;
  align-items: flex-end;
}

The stretch value stretches the flex items to fill the container (this is equal to normal, which is default). [S1]

.flex-container {
  display: flex;
  height: 200px;
  align-items: stretch;
}

The align-content Property 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]

With center, the flex lines are packed toward the center of the container. [S1]

.flex-container {
  display: flex;
  height: 400px;
  flex-wrap: wrap;
  align-content: center;
}

With space-between, the space between the flex lines are equal. [S1]

.flex-container {
  display: flex;
  height: 400px;
  flex-wrap: wrap;
  align-content: space-between;
}

True Centering with Flexbox To achieve true centering, set both the justify-content and the align-items properties to center. [S1]

.flex-container {
  display: flex;
  height: 400px;
  justify-content: center;
  align-items: center;
}

🛠️ 적용 사례 (Applied in summary)

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.

💻 코드 패턴 (Code patterns)

Center flex items on both axes (language: CSS):

.flex-container {
  display: flex;
  height: 400px;
  justify-content: center;
  align-items: center;
}

⚖️ 비교 및 선택 기준 (Comparison & decision criteria)

• align-items — aligns individual flex items along the cross-axis; works on single-line layouts. [S1]
• align-content — aligns whole flex lines and only has effect when items wrap onto multiple lines (requires flex-wrap: wrap). [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

No contradictions found in the source.

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.89
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: CSS Tutorial
• 관련 개념: CSS Flexbox Justify Content, CSS Flex Items, CSS Flexbox Responsive
• 참조 맥락: Referenced whenever aligning flex items vertically (cross-axis) or centering content within a flex container.

📚 출처 (Sources)

• [S1] W3Schools — CSS Flexbox Align Items — https://www.w3schools.com/css/css3_flexbox_container_align.asp

📝 변경 이력 (Change history)

• 2026-06-23: Initial draft synthesized from the W3Schools "CSS Flexbox Align Items" page (Astra wiki-curation, P-Reinforce v3.1 format).