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Web front-end development

Time:04-03

Mywidth. CSS file content is as follows:
Div. Box {
Width: 800 px; ! Important
Margin - left: auto;
Margin - right: auto;
color:blue;
}
When asked, the page shows the width of the? How to the web page display width 300 px, respectively 800 px, 500 px and then how to modify the file code?
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