message: [bugfix] Steps: incorrect active style in vertical direction
diff: position: relative;
  color: @gray-dark;
  + &__circle {
  + display: block;
  + width: 5px;
  + height: 5px;
  + border-radius: 50%;
  + background-color: @gray-dark;
  + }
  +
  &--horizontal {
  float: left;
  left: auto;
  right: -9px;
  }
  -
  - .van-step__line {
  - width: 0;
  - }
  }
  .van-step__circle-container {
  background-color: @border-color;
  }
  - &.van-step--finish {
  - color: @text-color;
  -
  - .van-step__circle,
  - .van-step__line {
  - background-color: @green;
  - }
  - }
  -
  &.van-step--process {
  color: @text-color;
  }
  }
  - .van-step__circle {
  - display: block;
  - width: 5px;
  - height: 5px;
  - border-radius: 50%;
  - background-color: @gray-dark;
  - }
  -
  &--vertical {
  float: none;
  display: block;
  .van-step__line {
  position: absolute;
  - top: 0;
  + top: 16px;
  left: -15px;
  width: 1px;
  height: 100%;
  font-size: 12px;
  }
  }
  + }
  + &:last-child {
  + .van-step__line {
  + width: 0;
  + }
  + }
  +
  + &--finish {
  + color: @text-color;
  +
  + .van-step__circle,
  + .van-step__line {
  + background-color: @green;
  + }
  }
  }
  