参考如下代码示例 <style> body,p,h1{ padding: 0; margin: 0; } html,body{ height: 100%; width: 100%; } html{ height: 100%; width: 100%; } .div1{ width: 100%; height: 100%; background-color: teal; } .div2{ position: fixed; width: 300px; height: 400px; margin: auto; background-co