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;//不可缺少否則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;//改變主軸為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為子盒子寬、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%) /*單獨設(shè)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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