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CSS align-items property는 바로 접하고 있는 flex items에 align-self 를 일괄적용한다. align-self property는 해당 item이 차지하는 공간의 중앙인지 시작인지 끝인지에 정렬한다.

이 속성은 현재 Flexbox 및 CSS Grid Layout에서 지원됩니다. Flexbox에서는 Cross Axis에있는 항목의 정렬을 제어하며, Grid Layout에서는 블록 축의 항목 정렬을 제어합니다.

Syntax

/* 기본 키워드 */ 
align-items: normal; 
align-items: stretch; 

/* 위치 맞춤 */ 
/* align-items는 왼쪽 및 오른쪽 값을 가져가지 않습니다. */
align-items: center; /* items를 중앙으로 정렬해줍니다. */ 
align-items: start; /* items를 시작점 부터 정렬해줍니다. */ 
align-items: end; /* items를 끝점 부터 정렬해줍니다. */ 
align-items: flex-start; /* Pack flex items from the start */ 
align-items: flex-end; /* Pack flex items from the end */ 
align-items: self-start; 
align-items: self-end; 

/* 기본 정렬 */
align-items: baseline; 
align-items: first baseline; 
align-items: last baseline; /* Overflow alignment (for positional alignment only) */ 
align-items: safe center; 
align-items: unsafe center; 

/* Global 값 */
align-items: inherit; 
align-items: initial; 
align-items: unset;

Values

normal
The effect of this keyword is dependent of the layout mode we are in:
  • In absolutely-positioned layouts, the keyword behaves like start on replaced absolutely-positioned boxes, and as stretch on all other absolutely-positioned boxes.
  • In static position of absolutely-positioned layouts, the keyword behaves as stretch.
  • For flex items, the keyword behaves as stretch.
  • For grid items, this keyword leads to a behavior similar to the one of stretch, except for boxes with an aspect ratio or an intrinsic sizes where it behaves like start.
  • The property doesn't apply to block-level boxes, and to table cells.
flex-start
The cross-start margin edges of the flex items are flushed with the cross-start edge of the line.
flex-end
The cross-end margin edges of the flex items are flushed with the cross-end edge of the line.
center
The flex items' margin boxes are centered within the line on the cross-axis. If the cross-size of an item is larger than the flex container, it will overflow equally in both directions.
start
The items are packed flush to each other toward the start edge of the alignment container in the appropriate axis.
end
The items are packed flush to each other toward the end edge of the alignment container in the appropriate axis.
self-start
The items are packed flush to the edge of the alignment container of the start side of the item, in the appropriate axis.
self-end
The items are packed flush to the edge of the alignment container of the end side of the item, in the appropriate axis.
baseline
first baseline
last baseline
All flex items are aligned such that their flex container baselines align. The item with the largest distance between its cross-start margin edge and its baseline is flushed with the cross-start edge of the line.
stretch
Flex items are stretched such that the cross-size of the item's margin box is the same as the line while respecting width and height constraints.
safe
Used alongside an alignment keyword. If the chosen keyword means that the item overflows the alignment container causing data loss, the item is instead aligned as if the alignment mode were start.
unsafe
Used alongside an alignment keyword. Regardless of the relative sizes of the item and alignment container and whether overflow which causes data loss might happen, the given alignment value is honored.

Formal syntax

normal | stretch | <baseline-position> | [ <overflow-position>? <self-position> ]

where
<baseline-position> = [ first | last ]? baseline
<overflow-position> = unsafe | safe
<self-position> = center | start | end | self-start | self-end | flex-start | flex-end

Example

CSS

#container {
  height:200px;
  width: 240px;
  align-items: center; /* Can be changed in the live sample */
  background-color: #8c8c8c;
}

.flex {
  display: flex;
  flex-wrap: wrap;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, 50px);
}

div > div {
  box-sizing: border-box;
  border: 2px solid #8c8c8c;
  width: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#item1 {
  background-color: #8cffa0;
  min-height: 30px;
}

#item2 {
  background-color: #a0c8ff;
  min-height: 50px;
}

#item3 {
  background-color: #ffa08c;
  min-height: 40px;
}

#item4 {
  background-color: #ffff8c;
  min-height: 60px;
}

#item5 {
  background-color: #ff8cff;
  min-height: 70px;
}

#item6 {
  background-color: #8cffff;
  min-height: 50px;
  font-size: 30px;
}

select {
  font-size: 16px;
}

.row {
  margin-top: 10px;
}

HTML

<div id="container" class="flex">
  <div id="item1">1</div>
  <div id="item2">2</div>
  <div id="item3">3</div>
  <div id="item4">4</div>
  <div id="item5">5</div>
  <div id="item6">6</div>
</div>

<div class="row">
  <label for="display">display: </label>
  <select id="display">
    <option value="flex">flex</option>
    <option value="grid">grid</option>
  </select>
</div>

<div class="row">
  <label for="values">align-items: </label>
  <select id="values">
    <option value="normal">normal</option>
    <option value="flex-start">flex-start</option>
    <option value="flex-end">flex-end</option>
    <option value="center" selected>center</option>
    <option value="baseline">baseline</option>
    <option value="stretch">stretch</option>

    <option value="start">start</option>
    <option value="end">end</option>
    <option value="self-start">self-start</option>
    <option value="self-end">self-end</option>
    <option value="left">left</option>
    <option value="right">right</option>

    <option value="first baseline">first baseline</option>
    <option value="last baseline">last baseline</option>

    <option value="safe center">safe center</option>
    <option value="unsafe center">unsafe center</option>
    <option value="safe right">safe right</option>
    <option value="unsafe right">unsafe right</option>
    <option value="safe end">safe end</option>
    <option value="unsafe end">unsafe end</option>
    <option value="safe self-end">safe self-end</option>
    <option value="unsafe self-end">unsafe self-end</option>
    <option value="safe flex-end">safe flex-end</option>
    <option value="unsafe flex-end">unsafe flex-end</option>
  </select>
</div>

Result

Specifications

Specification Status Comment
CSS Box Alignment Module Level 3
The definition of 'align-items' in that specification.
Working Draft Update to latest syntax definitions.
CSS Flexible Box Layout Module
The definition of 'align-items' in that specification.
Candidate Recommendation Initial definition

초기값normal
적용대상all elements
상속no
Mediavisual
Computed valueas specified
Animation typediscrete
Canonical orderthe unique non-ambiguous order defined by the formal grammar

Browser compatibility

Support in Flex layout

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support 52
Full support 52
Partial support 29
Notes
Notes Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52.
Full support 21
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Edge Full support 12
Full support 12
Full support 12
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Firefox Full support 20
Notes
Full support 20
Notes
Notes Multi-line flexbox has been supported since Firefox 28.
Full support 49
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
No support 18 — ?
Disabled
Disabled From version 18: this feature is behind the layout.css.flexbox.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Full support 48
Prefixed Disabled
Prefixed Implemented with the vendor prefix: -webkit-
Disabled From version 48: this feature is behind the layout.css.prefixes.webkit preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE Full support 11
Notes
Full support 11
Notes
Notes In Internet Explorer 10 and 11, if column flex items have align-items: center; set on them and their content is too large, then they will overflow the bounds of their container. See Flexbug #2.
Opera Full support 12.1Safari Full support 7
Prefixed
Full support 7
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
WebView Android Full support 52
Full support 52
Partial support 4.4
Notes
Notes Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52.
Full support Yes
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Chrome Android Full support 52
Full support 52
Partial support 29
Notes
Notes Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52.
Full support 25
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Edge Mobile Full support Yes
Full support Yes
Full support Yes
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Firefox Android Full support 20
Notes
Full support 20
Notes
Notes Multi-line flexbox has been supported since Firefox 28.
Full support 49
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
No support 18 — ?
Disabled
Disabled From version 18: this feature is behind the layout.css.flexbox.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Full support 48
Prefixed Disabled
Prefixed Implemented with the vendor prefix: -webkit-
Disabled From version 48: this feature is behind the layout.css.prefixes.webkit preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android Full support 12.1Safari iOS Full support 7
Prefixed
Full support 7
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Samsung Internet Android ?
first baseline and last baselineChrome ? Edge ? Firefox Full support 45IE ? Opera ? Safari ? WebView Android ? Chrome Android ? Edge Mobile ? Firefox Android Full support 45Opera Android ? Safari iOS ? Samsung Internet Android ?
start and endChrome ? Edge ? Firefox Full support 45IE ? Opera ? Safari ? WebView Android ? Chrome Android ? Edge Mobile ? Firefox Android Full support 45Opera Android ? Safari iOS ? Samsung Internet Android ?
left and rightChrome ? Edge ? Firefox Full support 45IE ? Opera ? Safari ? WebView Android ? Chrome Android ? Edge Mobile ? Firefox Android Full support 45Opera Android ? Safari iOS ? Samsung Internet Android ?
safe and unsafeChrome No support NoEdge No support NoFirefox Full support 63IE No support NoOpera No support NoSafari ? WebView Android ? Chrome Android ? Edge Mobile No support NoFirefox Android Full support 63Opera Android ? Safari iOS ? Samsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.

Support in Grid layout

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support 57Edge Full support 16Firefox Full support 52IE ? Opera Full support 44Safari Full support 10.1WebView Android Full support 57Chrome Android Full support 52Edge Mobile Full support YesFirefox Android Full support 52Opera Android Full support 44Safari iOS Full support 10.3Samsung Internet Android Full support 6.2

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

See also

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