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代码说明：

  一款基于CSS3的响应式侧边菜单，这款菜单可以在PC浏览器网页上和移动设备的网页上有着同样不错的效果，它会根据屏幕大小自动实现菜单位置的变化，可以让用户在不同分辨率的屏幕上获得最佳的体验。(A responsive side menu based on CSS3, which works equally well on PC browser pages and mobile device pages, automatically changes the menu position according to screen size, allowing users to get the best experience on different resolution screens.)