2、Aligning items to left, right, and center within the Navbar 这是block级别的class, 用在<div>上面 The .mx-auto class can be used to align the items to the center of the navbar. The .ms-auto class is used to align items to the right of the navbar. The .me-auto class is used...
container是最基本的布局。 给一个元素的class赋值为container之后，如果显示屏幕小于576，元素将要横向占...