css

怎么让一个 div 水平垂直居中

div 标签居中显示的一些归类总结

>书是人类进步的阶梯。——高尔基
#### 结构

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<div class="parent">
    <div class="child"></div>
</div>

样式

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    div.parent {
        display: flex;
        justify-content: center;
        align-items: center;
    }
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    div.parent {
        position: relative;
    }
    div.child {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }
    /* 或者 */
    div.child {
        width: 50px;
        height: 10px;
        position: absolute;
        top: 50%;
        left: 50%;
        margin-left: -25px;
        margin-top: -5px;
    }
    /* 或 */
    div.child {
        width: 50px;
        height: 10px;
        position: absolute;
        left: 0;
        top: 0;
        right: 0;
        bottom: 0;
        margin: auto;
    }
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    div.parent {
        display: grid;
    }
    div.child {
        justify-self: center;
        align-self: center;
    }
    /* 或着 */
    div.child {
        margin: auto;
    }
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    div.parent{
      display:flex;
    }
    div.child{
      margin:auto;
    }
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    div.parent {
        font-size: 0;
        text-align: center;
        &::before {
            content: "";
            display: inline-block;
            width: 0;
            height: 100%;
            vertical-align: middle;
        }
    }
    div.parent{
      display: inline-block;
      vertical-align: middle;
    }
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    .parent {
            display: table-cell;
            height: 200px;
            width: 200px;
            background-color: orange;
            text-align: center;
            vertical-align: middle;
    }
     .child {
            display: inline-block;
            width: 100px;
            height: 100px;
            background-color: blue;
    }

参考资料