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                # 水平垂直的概述 ## 1、塊級水平垂直居中 * 1、給自身`position:absolute;` `left:0;` `right:0;` `bottom:0; ` `top:0; margin:auto` * 2、`relative `+ `absolute` 父容器用relative定位,子容器用`absolute` `left: 50%;` `top:50%;` `translate:transform(-50%, -50%) ;` 針對于未知高和寬,如果對于已知可以直接用固定值,當然`transform`方法也可以用`margin`去做位移,但是這個必須要固定寬高。或者用calc進行計算`calc(50% - 50px)` * 3 `flex`方法 給父容器加flex布局, 并設置`justify-content:center;` `align-items:center;`用的相對比較多 * 4 在父容器用`table-cell`布局,`vertical-align:?middle; ` 子容器用`marigin:0 auto` 父容器做的是垂直居中,子容器做的是水平居中 * 5 `relative + inline-block` 父容器用`relative ` 如圖 ![](https://img.kancloud.cn/e7/d7/e7d753642677312c504d70145b14f9fc_612x752.png) ## 2、行內水平垂直居中 * 1 給div里面的文字水平垂直居中,在父容器用`table-cell`布局,`vertical-align:?middle; text-align:center; ` 效果圖: ![](https://img.kancloud.cn/ce/b3/ceb34008bd1772e4ea5aed71948c13f7_507x409.png) * 2 用`line-height` 設置可以使得里面的行內居中 ## 3、拖標水平垂直居中 float水平居中 ``` <div class="wrap"> <div class="content">123</div> </div> ``` ``` .content { width: 100px; height: 100px; background-color: #e92322; float: left; position: relative; left: -50%; } .wrap { float: left; position: relative; left: 50%; } ``` float垂直居中 ``` <style type="text/css"> #demo { width: 300px; height: 200px; background-color: grey; display: table-cell; vertical-align: middle; } .fl { float: left; width: 50px; height: 50px; background-color: black; } </style> ```
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