> For the complete documentation index, see [llms.txt](https://yamoo9.gitbook.io/css-grid/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://yamoo9.gitbook.io/css-grid/css-grid-layout-usage-guide/symmetrical-grid-layout/12-column-grid-system.md).
# 12 Column System
## 12 컬럼 그리드 시스템
12 컬럼 그리드는 웹 레이아웃을 구현하는 가장 대표적인 그리드 시스템입니다.
CSS Grid를 사용해 재사용 가능한 12 컬럼 그리드를 구현할 수 있습니다. 완성된 그리드 시스템은 다음과 같습니다.
{% embed url="" %}
일정한 열 너비와 거터 간격만 설정하면 손쉽게 12 컬럼 그리드를 만들 수 있습니다.
```css
.grid {
display: grid;
width: 120rem;
margin-left: auto;
margin-right: auto;
padding-right: 10px;
padding-left: 10px;
grid-template-columns: repeat(12, 1fr);
grid-auto-rows: minmax(5rem, auto);
grid-gap: 10px;
}
.grid .col-1 {
grid-column-end: span 1;
}
.grid .row-1 {
grid-row-end: span 1;
}
.grid .col-2 {
grid-column-end: span 2;
}
.grid .row-2 {
grid-row-end: span 2;
}
.grid .col-3 {
grid-column-end: span 3;
}
.grid .row-3 {
grid-row-end: span 3;
}
.grid .col-4 {
grid-column-end: span 4;
}
.grid .row-4 {
grid-row-end: span 4;
}
.grid .col-5 {
grid-column-end: span 5;
}
.grid .row-5 {
grid-row-end: span 5;
}
.grid .col-6 {
grid-column-end: span 6;
}
.grid .row-6 {
grid-row-end: span 6;
}
.grid .col-7 {
grid-column-end: span 7;
}
.grid .row-7 {
grid-row-end: span 7;
}
.grid .col-8 {
grid-column-end: span 8;
}
.grid .row-8 {
grid-row-end: span 8;
}
.grid .col-9 {
grid-column-end: span 9;
}
.grid .row-9 {
grid-row-end: span 9;
}
.grid .col-10 {
grid-column-end: span 10;
}
.grid .row-10 {
grid-row-end: span 10;
}
.grid .col-11 {
grid-column-end: span 11;
}
.grid .row-11 {
grid-row-end: span 11;
}
.grid .col-full, .grid .col-12 {
grid-column: 1 / -1;
}
```
HTML 요소에 설계한 12 컬럼 그리드를 적용해 레이아웃을 형성합니다.
```markup
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
3
3
3
3
4
4
4
5
2
5
6
6
7
3
2
8
4
9
2
1
10
2
11
1
12
```
---
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