Card
https://getbootstrap.com/docs/4.3/components/card/
更多效果的轮播图
https://getbootstrap.com/docs/4.3/components/carousel/
漂亮的上传文件 input 效果
https://getbootstrap.com/docs/4.3/components/input-group/
色调看起来更舒服的导航栏
https://getbootstrap.com/docs/4.3/components/navbar/
CSS 实现的 loading
https://getbootstrap.com/docs/4.3/components/spinners/
右上角的提示框
https://getbootstrap.com/docs/4.3/components/toasts/
针对父元素的clearfix
https://getbootstrap.com/docs/4.3/utilities/clearfix/
阴影效果
https://getbootstrap.com/docs/4.3/utilities/shadows/
- shadow-none
- shadow-sm
- shadow
- shadow-lg
链接范围扩大
https://getbootstrap.com/docs/4.3/utilities/stretched-link/
不再内置图标
推荐 font awesome
https://getbootstrap.com/docs/4.3/extend/icons/
图片描述
https://getbootstrap.com/docs/4.3/content/figures/