- flex布局，新版本
//css
body {
display: flex;
justify-content: center;
align-items: center;
}
.box {
background: red;
width: 200px;
height: 200px;
}
//html
<body>
<div class="box"></div>
</body>
- flex布局，老版本
//css
body {
display: -webkit-box;
-webkit-box-pack: center;
-webkit-box-align: center;
}
.box {
background: red;
width: 200px;
height: 200px;
}
//html
<body>
<div class="box"></div>
</body>
- 容器position为absolute
//css
.box {
background: red;
width: 200px;
height: 200px;
position: absolute;
left: 0;
right: 0;
top: 0;
bottom: 0;
margin: auto;
}
//或者
.box {
background: red;
width: 200px;
height: 200px;
position: absolute;
left: 50%;
right: 50%;
margin-top: -100px;
margin-left: -100px;
}
//或者
.box {
background: red;
width: 200px;
height: 200px;
position: absolute;
left: 50%;
right: 50%;
transform: translate(-50%,-50%);
}
//html
<body>
<div class="box"></div>
</body>
