How to set center alignment in css

How to set center alignment in css: 1. Horizontal centering through "text-align:center" or "margin:vertical auto;"; 2. Vertical centering through "line-height"; 3. "Flexible layout" realizes horizontal and vertical centering and so on.

The operating environment of this article: Windows7 system, HTML5&&CSS3 version, Dell G3 computer.

css——Center alignment method

• ##text-align:center —— Horizontal centering

is only valid for inline elements such as text, pictures, buttons, etc. (display is set to inline or inline-block, etc.) for horizontal centering

• margin: vertical auto; ——Horizontal centering

Only horizontal centering, and invalid for floating element positioning

.father{ width:500px; height:200px; background-color::#f98769; overflow:hidden;//不可缺少否则margin-top不生效 } .son{ width: 100px; height: 100px; margin:50px auto ; background-color: #ff0000; }

• line-height —— Vertical centering

line-height=height, only valid for one line of text

• Use table——Horizontal and vertical centering

The align='center' and valign='middle' attributes of td/th can be centered horizontally and vertically

• Flexible layout——horizontal, Vertical centering

.father{display:flex;justity-content:center;align-items:center;}.father{display:flex;flex-direction:column;//改变主轴为cross axisjustity-content:center;}

• Use display: table-cell - horizontal and vertical centering

For those that are not tables element, we can simulate it into a table cell through display:table-cell

.father{ height:300px; background:#ccc; display:table-cell; /*IE8以上及Chrome、Firefox*/ vertical-align:middle; /*IE8以上及Chrome、Firefox*/ text-align:center; } .son{ display:inline-block;//或是inline }

• Strange skills - the child must be the same as the father (the width and height of the child element are known) —— Horizontal and vertical centering

  
  

.father{position:relative;}.son{//m、n为子盒子宽、高的一半position:absolute;left:50%;top:50%;margin-left:-mpx;margin-top:-npx;

• Unknown child element width and height——Horizontal and vertical centering

  
  

.father { position:relative;}.son { position:absolute; top:50%; left:50%: transform:translate(-50%,-50%) /*单独设置transform:translateY(-50%);*/}

• Pseudo element method - vertical centering

  
  

.father{ position: relative; } .father::before{ content: " "; display: inline-block; height: 100%; width: 1%; vertical-align: middle; } .son{ display: inline-block; vertical-align: middle; }

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