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Css horizontal center, vertical center, css vertical center

Source: Internet
Author: User
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Css horizontal center, vertical center, css vertical center

Key Point 1: Set [position: absolute;] For containers ;]

Key Aspect 2: Container setting [top: 50%; left: 50% ;]

Key 3: You need to know the actual width and heigh of the container (which can be preset or dynamically obtained at runtime)

Key 4: horizontal center: margin-left =-1 * (width/2). For example, if width is 280px, set [margin-left: 140px ;]

Key 5: vertical center: margin-top =-1 * (height/2). For example, if the height is 110px, set [margin-top: 55px ;]

 

Example:

Html

<Html> 

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;    }


Running Effect




Actual running size

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