box-shadow巧用

.color-number-box .color-number:before {

position: absolute;

bottom: 4px;

left: 0;

width: 288px;

height: 2px;

-webkit-box-shadow: 272px 2px 0 #ff5847, 256px 2px 0 #ffd200, 224px 2px 0 #21cf93, 96px 2px 0 #ff9e47, 0 2px 0 #317cf8;

box-shadow: 272px 2px 0 #ff5847, 256px 2px 0 #ffd200, 224px 2px 0 #21cf93, 96px 2px 0 #ff9e47, 0 2px 0 #317cf8;

content: "";

}