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总结一下利用css实现盒子内部 div居中的几种方法
1.水平居中
1）margin： 0 auto
<style>
.box {
width: 300px;
height: 300px;
border: 2px solid black;
}
.box1 {
width: 100px;
height: 100px;
background: red;
margin:0 auto;
}
</style>
<body>
<div class="box">
<div class="box1"></div>
</div>
</body>
2.水平垂直居中
1）定位和需要定位的元素的margin减去宽高的一半
局限性：需要知道需要垂直居中的宽高才能实现
<style>
.box {
width: 300px;
height: 300px;
border: 2px solid black;
position:relative;
}
.box1 {
width: 100px;
height: 100px;
background: red;
position:absolute;
top:50%;
left:50%;
margin-top: -50px;
margin-left: -50px;
}
</style>
<body>
<div class="box">
<div class="box1"></div>
</div>
</body>
2）position定位和margin:auto;
不受宽高限制
<style>
.box {
width: 300px;
height: 300px;
border: 2px solid black;
position:relative;
}
.box1 {
width: 100px;
height: 100px;
background: red;
position:absolute;
left:0;
top:0;
right:0;
bottom:0;
margin:auto;
}
</style>
<body>
<div class="box">
<div class="box1"></div>
</div>
</body>
3）定位和transfrom
<style>
.box {
width: 300px;
height: 300px;
border: 2px solid black;
position:relative;
}
.box1 {
width: 100px;
height: 100px;
background: red;
position:absolute;
left:50%;
top:50%;
transform: translate(-50%,-50%);
}
</style>
<body>
<div class="box">
<div class="box1"></div>
</div>
</body>
4）flex居中
<style>
.box {
width: 300px;
height: 300px;
border: 2px solid black;
display:flex;
justify-content: center;
align-items: center;
}
.box1 {
width: 100px;
height: 100px;
background: red;
}
</style>
<body>
<div class="box">
<div class="box1"></div>
</div>
</body>
5）diplay：table-cell
<style>
.box {
width: 300px;
height: 300px;
border: 2px solid black;
display:table-cell;
vertical-align: middle;
text-align: center;
}
.box1 {
width: 100px;
height: 100px;
background: red;
display:inline-block;
}
</style>
<body>
<div class="box">
<div class="box1"></div>
</div>
</body>