<style>
.parent:before {
display: table;
content: " ";
}
.child {
margin: 20px auto;
}
</style>
<div class="parent">
<div class="child">Hello world!</div>
</div>
本文共 206 字，大约阅读时间需要 1 分钟。
<style>
.parent:before {
display: table;
content: " ";
}
.child {
margin: 20px auto;
}
</style>
<div class="parent">
<div class="child">Hello world!</div>
</div>
转载于:https://my.oschina.net/af666/blog/877835