Please tell me how to float the div layer: for example, how to float the login dialog div layer up and down following the page_html/css_WEB-ITnose

I am struggling to find a simple solution online. There is too much information online. Please give me a simple example. It can be implemented with css or jquery. Thank you very much

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If it is not position:fixed; it will move with the page

It is not position:fixed; They will all move with the page
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<script> <br> window.onscroll= window.onresize=function(e){ <br> var d = document.getElementById("y1"); <br> sTop = Math.max(document.body.scrollTop,document.documentElement.scrollTop) <br> d.style.top = sTop 200 "px" ; <br> d.style.left = (document.body.clientWidth-d.offsetWidth)/2 "px"; <br> } <br> </script>

position:fixed; is floating.