Align the pop-up window and align the pop-up window

Source: Internet
Author: User

Align the pop-up window and align the pop-up window

The center of the pop-up box is frequently encountered during the recent page creation,

I consulted Daniel and finally got it out,

Implementation principle:

1. Define a pseudo class for the peripheral box: before

2. The peripheral box defines the fixed attribute.

3. Define the content box.

 

Define the peripheral box:

1 outbox {2 position: fixed; 3 top: 0; 4 right: 0; 5 bottom: 0; 6 left: 0; 7 display: block; 8 text-align: center; 9}

Define the external box pseudo class:

Outbox: before {content = ""; width: 0; height: 100%; display: inline-block; vertical-align: middle ;}

Definition content box:

1 contentbox {2 display: inline-block; 3 vertical-align: middle; 4 text-align: center; 5}

 

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