自定义 border 为 dashed 时的虚线间距(水平方向，淡灰色)

.line {
  width: 90%;
  margin-top: 75rpx;
  background: linear-gradient(to right, #E5E5E5 0%, #E5E5E5 50%, transparent 50%);
  background-size: 18rpx 4rpx; 
  background-repeat: repeat-x; 
  margin-left: 20rpx;
}