Center horizontally
Inline elements
Set text-align: center
block-level element
1. First define a width and height, and then center according to the left and right movement of the margin
2. Use the four properties of absolute positioning to center and margin: auto;
3. Use absolute positioning, then Set the value of left top to 50%, and use
transform:translate(-50%,-50%);
4.The elements in the play need to be set to display:inline-block; then its parent element is set to text-aligin:center ;
5. By setting float
6. Setting flexible layout
display: flex;
justify-content: center
Center horizontally and vertically
1.弹性布局,为父元素设置
display:flex;
justify-content:center;
align-items:center;
2.position定位
父元素设为fixed,上下左右都为0,margin设置为auto。子元素设为fixed,上下左右都为0,margin设置为auto。
position: fixed;
top: 0;
right: 0;
left: 0;
bottom: 0;
margin: auto;
3.使用绝对定位
```html
/*此方法是在给定宽高的情况下;*/
.one{
width: 200px;
height: 200px;
background-color: lightblue;
position: absolute;
left: 50%;
top: 50%;
/*margin: -100px 0 0 -100px;*/
transform:translate(-50%,-50%);
}
4.父元素设置display:relative,子元素设置display:absolute;上下左右都为0,margin设置auto
```html
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<div class="one">
<div class="two">
</div>
</div>
</body>
<style type="text/css">
.one{
width: 200px;
height: 200px;
background-color: lightblue;
position: relative;
}
.two{
width: 100px;
height: 100px;
background-color: red;
position: absolute;
top: 0;
right: 0;
left: 0;
bottom: 0;
margin: auto;
}
</style>
</html>
5.父元素设置display:flex;子元素margin:auto
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<div class="one">
<div class="two">
</div>
</div>
</body>
<style type="text/css">
.one{
width: 200px;
height: 200px;
background-color: lightblue;
display: flex;
}
.two{
width: 100px;
height: 100px;
background-color: red;
margin: auto;
}
</style>
</html>