1.字体颜色渐变
background-image:linear-gradient(to bottom, #5affa, #0076ff);
-webkit-background-clip:text;
-webkit-text-fill-color:transparent;
2.背景颜色渐变
background:linear-gradient(to bottom, #242424, #1a1a1a);
3.自适应宽度
width:calc(25%-1px);
4.div中右侧叠加一个div
z-index:99;
position:absolute;
right:0px;
5.处理溢出、清除浮动、解决外边距塌陷
overflow:hidden;