The code is as follows:
<!doctype html><!--Declaration Document type- The effect diagram is as follows:
Knowledge Points:Application of position:fixed;
The style of the set element is known to be position:fixed; , the elements are positioned relative to the browser window, allowing for page effects such as sidebar bars. At the same time, you can set the width:100%;height:100% for the element;. Because the element is relative to the browser window, the element fills the entire page at this point.Note: Writing a mask layer in the BODY element is not effective.
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