How to keep the content position of the html page centered and not change when the browser shrinks_html/css_WEB-ITnose

I want the positioning effect of the things in the htm page I wrote to be like: http://www.diandian.com/register

Even if the browser is zoomed out, it is still in the middle. How to do it? Please guide me

Reply to the discussion (solution)

Use css positioning to set the width, length and position of the div

Get the length and width of the browser and try to calculate it

If your middle content is contained in a div, set this div margin: 0 auto; if the height and width are determined, position: absolute ; left: 50%; top: 50%; margin-top: - average height; margin-left: - average width; note that there is a negative sign (-) in front; I still don’t understand, please post an in-site message