css居中那点事

使用css居中有很多种方式，在这里写几个最佳实践。代码简单粗暴，适用性强，让你不必这点小事烦恼，提升你的工作效率，早几分钟下班回家LOL岂不是美滋滋
不多说废话，直接上代码

• 基本的样式和布局

<div class="container">
        <div class="inner">
        </div>
 </div>

    .container {
        height: 200px;
        width: 200px;
        background: #369;
    }

    .inner {
        height: 50px;
        width: 50px;
        background: #963;
    }

• 左右居中最简单的两种写法

    <p>左右居中1</p>
    <div class="container center1">
        <div class="inner center-inner1">

        </div>
    </div>

    <p>左右居中2</p>
    <div class="container center2">
        <div class="inner">
        </div>
    </div>

 .center1 {
        text-align: center;
    }

    .center-inner1 {
        display: inline-block;
    }

    .center2 {
        display: flex;
        justify-content: center;
    }

    .center-inner2 {
        display: inline-block;
    }

• 垂直居中的两种最简单写法

<p>垂直居中1</p>
    <div class="container center3">
        <div class="inner center-inner3"></div>
    </div>

    <p>垂直居中2</p>
    <div class="container center4">
        <div class="inner center-inner4"></div>
    </div>

 .center3 {
        display: flex;
        align-items: center;
    }

    .center4 {
        position: relative;
    }

    .center-inner4 {
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
    }

• 左右居中+垂直居中

    <p>左右居中+垂直居中</p>
    <div class="container center5">
        <div class="inner"></div>
    </div>

    .center5 {
        display: flex;
        align-items: center;
        justify-content: center;
    }

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