CSS centering can be centered as the browser becomes larger or smaller_html/css_WEB-ITnose

Key code:

Use of external DIV: text-align:center;

Use of internal DIV: margin-left:auto;margin-right:auto

Example:

<div style="text-align: center">    <div style="margin-left: auto;margin-right: auto;">        <fieldset>            <legend>居中</legend>        </fieldset>    </div></div>