CSS style to center the HTML tag in the browser

CSS style to center the HTML tag in the browser
CSS style:

Copy code
The code is as follows:

<style type="text/css">
#login{
position:absolute;
top:50%;
left:50%;
margin-left: - half the width of the label;
margin-top: - half the height of the label;
}
</style>

HTML part:

Copy code
The code is as follows:

<div id="login"></div>

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