Parent element text-align:center;Child element:inline-block;
Advantages: good compatibility;
Disadvantages: need to set child elements and parent elements at the same time
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水平居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
text-align: center;
}
.child {
display: inline-block;
width: 300px;
height: 100px;
background: blue;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>Sub-element margin:0 auto;
Advantages: good compatibility
Disadvantages: required Specify width
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水平居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
}
.child {
width: 300px;
height: 100px;
background: blue;
margin:0 auto;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>Child elements{display:table;margin:0 auto;}
Advantages: Only need to set itself
Disadvantages: IE6,7 need to adjust the structure
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水平居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
}
.child {
width: 300px;
height: 100px;
background: blue;
margin:0 auto;
display:table;margin:0 auto;s
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>Parent Element: relative; child element: absolute; left: 50%; margin-left: - half of the width
Advantages: Good compatibility
Disadvantages: Need to know the width of the child element
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水平居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
position: relative;
top: 0;
left: 0;
}
.child {
width: 300px;
height: 100px;
background: blue;
position: absolute;
top: 0;
left: 50%;
margin-left: -150px;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>Parent element: relative; child element: absolute; left:50%; transform :translate(-50%,0);
Advantages: Poor compatibility
Disadvantages: No need to know the subtitles The width of the element
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水平居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
position: relative;
top: 0;
left: 0;
}
.child {
width: 300px;
height: 100px;
background: blue;
position: absolute;
top: 0;
left: 50%;
transform: translate(-50%,0);
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>Flexible box: Parent element: display:flex;justify-content:center;
Advantages: Simple
Disadvantages: Poor compatibility
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水平居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
display: flex;
justify-content: center;
}
.child {
width: 300px;
height: 100px;
background: blue;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>vertical-align:center;
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水平居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
display:table-cell;
vertical-align:middle;
}
.child {
width: 300px;
height: 100px;
background: blue;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>垂直居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
vertical-align:middle;
line-height:450px;
}
.child {
width: 300px;
height: 100px;
background: blue;
display:inline-block;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>
<!-- 这种方法需要知道父元素和子元素的高度，父元素的line-height的值为父元素高度减去子元素高度的一半。-->Parent element: position:relative;Child element: positon:absolute;top:50%;transform:translate( 0,-50%);
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>垂直居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
position: relative;
top: 0;
left: 0;
}
.child {
width: 300px;
height: 100px;
background: blue;
position: absolute;
top: 50%;
left:0;
transform: translate(0,-50%);
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>Parent element: position:relative; Child element: positon:absolute;top:50%;margin-top:- Half the height of the child element;
Parent element: display:flex;align-items:center;
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>垂直居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
display: flex;
align-items: center;
}
.child {
width: 300px;
height: 100px;
background: blue;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>Parent element: display:table-cell;vertical-align:middle;text-align:center;
Child element; display:inline-block;
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>垂直居中1</title>
<style>
.parent {
width: 500px;
height: 400px;
background: red;
display:table-cell;
vertical-align:middle;
text-align:center;
}
.child {
width: 300px;
height: 100px;
background: blue;
display: inline-block;
}
</style>
</head>
<body>
<p class="parent">
<p class="child"></p>
</p>
</body>
</html>Parent element: position:relative;
Child element: position:absolute
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