如何让我的网站移动和平板电脑兼容？

我想让我现有的网站在手机，平板电脑上观看时自动调整，甚至在桌面上调整屏幕时也是如此。

I want to make my existing website automatically adjust itself when viewed either on mobiles, tablets, or even when you adjust your screen on a desktop.

如果不这么做，如果太难了，你有什么建议？我基本上想要一个使用相同网址的ipad和iphone（android）版本，当检测到移动浏览器时会自动指向。

Failing that, if it's too difficult, what suggestions do you have?? I basically want an ipad and iphone (android) version that uses the same url, with an auto direct when mobile browsers are detected.

非常感谢