CSS的background渐变色或填充

0deg代表从下到上渐变 90deg代表从左到右渐变

比如

background: linear-gradient(90deg, black, transparent);

background: linear-gradient(90deg, red, green);

background: linear-gradient(0deg, red, green);

background: linear-gradient(0deg, black, transparent);

也可以实现不同颜色的拼接，比如

background: linear-gradient(90deg, red 0%,red 80%,green 80%, green 100%);

类似进度条的样式

background: linear-gradient(90deg, #888 0%,#888 80%,white 80%, white  100%);

或