---
id: css-flexbox-justify-content
title: "CSS Flexbox Justify Content"
category: "Frontend"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["justify-content", "flexbox main-axis alignment", "flex justify", "horizontal flex alignment", "space-between flexbox"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.89
created_at: 2026-06-23
updated_at: 2026-06-23
review_reason: ""
merge_history: []
tags: ["css", "web", "frontend", "w3schools", "flexbox", "justify-content"]
raw_sources: ["https://www.w3schools.com/css/css3_flexbox_container_justify.asp"]
applied_in: []
github_commit: ""
---

# [[CSS Flexbox Justify Content]]

## 🎯 한 줄 통찰 (One-line insight)
The `justify-content` property aligns flex items along the main-axis (horizontally) within a flex container, offering values from simple edge/center alignment to several space-distribution modes. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Main-axis alignment** — `justify-content` controls how flex items are positioned along the main-axis (horizontally) inside a flex container. [S1]
- **Default is `flex-start`** — items align at the beginning of the container unless another value is set. [S1]
- **Two families of values** — positional (`center`, `flex-start`, `flex-end`) and space-distribution (`space-around`, `space-between`, `space-evenly`). [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Apply on the container** — `justify-content` is always declared on the element with `display: flex`, not on the items. [S1]
- **Space distribution choice** — pick `space-between` (no outer space), `space-around` (half-size outer space), or `space-evenly` (equal space everywhere) depending on the desired edge gaps. [S1]

## 📖 세부 내용 (Details)
The `justify-content` property aligns the flex items along the main-axis (horizontally) within a flex container. [S1]

**`center`** — aligns the flex items in the center of the container. [S1]
```css
.flex-container {
  display: flex;
  justify-content: center;
}
```

**`flex-start`** — aligns the flex items at the beginning of the container (this is default). [S1]
```css
.flex-container {
  display: flex;
  justify-content: flex-start;
}
```

**`flex-end`** — aligns the flex items at the end of the container. [S1]
```css
.flex-container {
  display: flex;
  justify-content: flex-end;
}
```

**`space-around`** — displays the flex items with space before, between, and after the lines. [S1]
```css
.flex-container {
  display: flex;
  justify-content: space-around;
}
```

**`space-between`** — displays the flex items with space between the lines. [S1]
```css
.flex-container {
  display: flex;
  justify-content: space-between;
}
```

**`space-evenly`** — displays the flex items with equal space around them. [S1]
```css
.flex-container {
  display: flex;
  justify-content: space-evenly;
}
```

## 🛠️ 적용 사례 (Applied in summary)
The page's own examples apply each value to a `.flex-container` declared with `display: flex`. No external project/commit applications found in the source.

## 💻 코드 패턴 (Code patterns)
Align flex items on the main-axis (language: CSS):
```css
.flex-container {
  display: flex;
  justify-content: center; /* or flex-start | flex-end | space-around | space-between | space-evenly */
}
```

## ⚖️ 비교 및 선택 기준 (Comparison & decision criteria)
- **`space-between`** — no space before the first or after the last item; full gaps only between items. [S1]
- **`space-around`** — space before, between, and after the lines (outer gaps are half the inner gaps). [S1]
- **`space-evenly`** — equal space around every item, including the container edges. [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 Align Items]], [[CSS Flex Items]], [[CSS Flexbox Responsive]]
- **참조 맥락:** Referenced whenever positioning flex items horizontally along the main-axis of a flex container.

## 📚 출처 (Sources)
- [S1] W3Schools — CSS Flexbox Justify Content — https://www.w3schools.com/css/css3_flexbox_container_justify.asp

## 📝 변경 이력 (Change history)
- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Flexbox Justify Content" page (Astra wiki-curation, P-Reinforce v3.1 format).
