菜鸟教程在线编辑器

AI 编程工具

 
                <!DOCTYPE html>
<html>
<body>

<p>With HTML:</p>
<hr noshade="noshade">

<p>With CSS:</p>
<hr style="height:2px;border-width:0;color:gray;background-color:gray">

</body>
</html>
              