我想移动左导航栏菜单 <div> 屏幕尺寸为800px时返回顶部

Question

当我将屏幕缩小到800px时，左侧导航栏将隐藏起来，它将显示在页面顶部的下拉菜单中

Answer 1

You should use a media query for this and set the width of the media query to 800px

for example

@media screen and (min-width: 800px) {
    #leftmenu {
        #css to put menu at top
    }
}