基本样式
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>Document</title>
<link rel="stylesheet" href="./style.css" />
</head>
<body>
<div id="out">
<div id="inner"></div>
</div>
</body>
</html>
CSS
#out {
width: 300px;
height: 300px;
background-color: red;
}
#inner {
width: 50px;
height: 50px;
background-color: blue;
}
方式一:flex
#out {
display: flex;
justify-content: center;
align-items: center;
}
方式二:flex(父)+margin(子)
#out{
display:flex;
}
#inner{
margin:auto;
}
方式三:position + calc
#out {
position: relative;
}
#inner {
position: absolute;
left: calc(50% - 25px);
top: calc(50% - 25px);
}
方式四:position + margin
#out {
position: relative;
border: 1px solid red;/*防止垂直方向margin重叠*/
}
#inner {
margin-left: calc(50% - 25px);
margin-top: calc(50% - 25px);
}
方式五:position + margin(2)
#out {
position: relative;
}
#inner {
position: absolute;
top: 50%;
left: 50%;
margin-top: -25px;
margin-left: -25px;
}
方式六:position + margin(3)
#out {
position: relative;
}
#inner {
top: 0;
left: 0;
right: 0;
bottom: 0;
position: absolute;
margin: auto;
}
#out {
position: relative;
}
#inner {
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}
方式八:lineheight(父) + display:inline-block(子)
#out {
line-height: 325px;
vertical-align: center;
text-align: center;
}
#inner {
display: inline-block;
}
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