元素水平垂直居中方法
1.绝地定位 + margin: auto
<style>
.box1 {
width: 500px;
height: 500px;
background-color:aqua;
position: relative;
}
.box2 {
width: 100px;
height: 100px;
background-color: blanchedalmond;
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
margin: auto;
}
</style>
</head>
<body>
<div class="box1">
<div class="box2"></div>
</div>
</body>
2. 绝对定位 + margin 负值
<style>
.box1 {
width: 500px;
height: 500px;
background-color:aqua;
position: relative;
}
.box2 {
width: 100px;
height: 100px;
background-color: blanchedalmond;
position: absolute;
top: 50%;
left: 50%;
margin-left: -50px; // width 的一半
margin-top: -50px; // height 的一半
}
</style>
</head>
<body>
<div class="box1">
<div class="box2"></div>
</div>
</body>
3.绝对定位 + transform
<style>
.box1 {
width: 500px;
height: 500px;
background-color:aqua;
position: relative;
}
.box2 {
width: 100px;
height: 100px;
background-color: blanchedalmond;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
</style>
</head>
<body>
<div class="box1">
<div class="box2"></div>
</div>
</body>
4.flex 布局
将父元素设置为 display: flex , justify-content: center 主轴居中,align-items: center; 交叉轴居中
<style>
.box1 {
width: 500px;
height: 500px;
background-color:aqua;
display: flex;
justify-content: center;
align-items: center;
}
.box2 {
width: 100px;
height: 100px;
background-color: blanchedalmond;
}
</style>
</head>
<body>
<div class="box1">
<div class="box2"></div>
</div>
</body>
5. table-cell(未脱离文档流的)
设置父元素的display:table-cell,并且vertical-align:middle,这样子元素可以实现垂直居中。
<style>
.box1 {
width: 500px;
height: 500px;
background-color:aqua;
display: table-cell;
vertical-align: middle;
}
.box2 {
width: 100px;
height: 100px;
background-color: blanchedalmond;
margin: 0 auto;
}
</style>
</head>
<body>
<div class="box1">
<div class="box2"></div>
</div>
</body>