参考:https://www.cnblogs.com/liangdecha/p/9797124.html
线性渐变(Linear Gradients)- 向下/向上/向左/向右/对角方向
径向渐变(Radial Gradients)- 由它们的中心定义
background: linear-gradient(to left,#d3959b,#bfe6ba); //右→左
background: linear-gradient(to right,#d3959b,#bfe6ba);//做由左到右
background: linear-gradient(to top,#d3959b,#bfe6ba);//下到上
background: linear-gradient(to bottom,#d3959b,#bfe6ba);//上到下
background: linear-gradient(to top right,#d3959b,#bfe6ba);//从左下角到右上角,对角线角度
6、background: linear-gradient(45deg,#d3959b,#bfe6ba);
7、background: linear-gradient(45deg,#d3959b 20%,#bfe6ba);
用百分比指定起始颜色的位置,默认值为0%;
8、background: linear-gradient(to right,#feac5e,#c779d0,#4bc0c8);
9、background: linear-gradient(45deg,#feac5e,#c779d0,#4bc0c8);
10、background: linear-gradient(45deg,rgba(254,172,94,0.5),rgba(199,121,208,0.5),rgba(75,192,200,0.5));
rgba使用了0.5的透明度