css水平居中方式

<div class="center1">我是测试文字哦</div>
<div class="center1"><span>我是测试标签span</span></div>

.center1{
    text-align:center;
}

<div class="center2">我是有宽度的块元素</div>

.center2{
    margin:0 auto;
    width:200px;
    background: tan;
}

<div class="center3">我是测试居中方式display:table的div</div>

.center3{
    display: table;
    margin:0 auto;
    background: springGreen;
}