Css center alignment setting method: 1. Horizontal centering [text-align:center]; 2. Horizontal centering [margin: 0 auto]; 3. Vertical centering [line-height]; 4. Use tables , horizontal and vertical centering; 5. Flexible layout, horizontal and vertical centering.
The operating environment of this tutorial: windows7 system, css3 version, DELL G3 computer.
How to set css center alignment:
1. text-align:center - horizontal centering
Only for text, pictures, buttons, etc. Inline elements are valid (display is set to inline or inline-block, etc.) for horizontal centering
2, margin: 0 auto; —— Horizontal centering
is only horizontally centered, and is 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; }
3. line-height - vertical centering
line-height=height, only valid for one line of text
4. Use table - horizontal and vertical centering
The align='center' and valign='middle' attributes of td/th can be centered horizontally and vertically
5. Flexible layout - horizontal and vertical centering
.father{ display:flex; justity-content:center; align-items:center; } .father{ display:flex; flex-direction:column;//改变主轴为cross axis justity-content:center; }
6. Use display: table-cell - horizontal and vertical centering
For those elements that are not tables, we can use display:table-cell to simulate it into a 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 }
7. 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;
8. The width and height of the unknown child element - 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%);*/ }
9. 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; }
Recommended related tutorials: CSS video tutorial
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