css horizontal centering, vertical centering techniques_html/css_WEB-ITnose

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Release： 2016-06-24 11:46:58

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Point 1: Container settings [position: absolute;]

Point 2: Container settings [top: 50%;left: 50%;]

Points 3: Know the actual width and height of the container (can be preset or dynamically obtained at runtime)

Point 4: Horizontal centering: margin-left = -1* (width/2 ), for example, width is 280px, then set [margin-left:140px;]

Point 5: vertical centering: margin-top = -1*(height/2), for example, height is 110px, then set 【margin-top:55px;】

Examples are as follows:

html

<html><head></head><body><div id="alert">    <div class="alert-header" style="display: none;">信息提示</div>    <div class="alert-message">GOOD</div>    <div class="alert-footer">        <div class="btn-close">确定</div>    </div></div></body></html>

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css

    #alert {        position: absolute;        width: 280px;        top: 50%;        left: 50%;        margin-top: -55px;        margin-left: -140px;        border-radius: 5px;        background: #fff;        z-index: 1000000;        padding: 20px;    }

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Running effect

Actual size at runtime

Related labels：

css水平居中，竖直居中技巧

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