html如何使⼀个盒⼦⽔平垂直居中⽅法⼀：利⽤定位（常⽤⽅法，推荐）
<style>
div {
width: 100px;
height: 100px;
border: 1px solid #999;
position: absolute;
top: 50%;
left: 50%;
margin-top: -50px;
margin-left: -50px;
}
</style>
⽅法⼆：利⽤ margin:auto;
div {
width: 100px;
height: 100px;
border: 1px solid #999;
position: absolute;
margin: auto;
top: 0;
left: 0;
right: 0;
bottom: 0;
}
⽅法三：利⽤ display:table-cell
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">    <title>Document</title>
<style>
.parent {
width: 500px;
height: 500px;
border: 1px solid #000;
display: table-cell;
vertical-align: middle;
text-align: center;//⽂字居中
}
.child {
width: 100px;
height: 100px;
line-height: 100px; //给line-height让⽂字居中
border: 1px solid #999;
display: inline-block;
}
</style>
</head>
<body>
<div class="parent">
<div class="child">我是⼦元素</div>
</div>
</b
⽅法四：利⽤ display：flex；设置垂直⽔平都居中
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.parent {
width: 500px;
height: 500px;
border: 1px solid #000;
display: flex;
justify-content: center;
align-items: center;
text-align: center;
}
.child {
width: 100px;
height: 100px;
line-height: 100px;
border: 1px solid #999;
}
</style>
</head>
<body>
<div class="parent">
<div class="child">我是⼦元素</div>
</div>
</body>
</html>
⽅法五：计算⽗盒⼦与⼦盒⼦的空间距离(这跟⽅法⼀是⼀个道理 需要已知⾼度、宽度)
.parent {
width: 500px;
height: 500px;
border: 1px solid #000;
}
.child {
width: 100px;
height: 100px;
border: 1px solid #999;
margin-top: 200px;
margin-left: 200px;
}
⽅法六：利⽤ transform （原理跟⽅法⼀⼀样，不同的是这个可以不需要知道盒⼦⾼宽）
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">    <title>Document</title>
<style>
.
parent {
width: 500px;
height: 500px;
border: 2px solid #000;
position: relative;
}
.child {
width: 100px;
height: 100px;
border: 2px solid palevioletred;
position: absolute;
html怎么让所有内容居中
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
</style>
</head>
<body>
<div class="parent">
<div class="child">我是⼦元素</div>
</div>
</body>
</html>

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