message: [improvement] Sku: update button style
diff: &-header-item {
  margin-top: @padding-xs;
  color: @gray-dark;
  - font-size: 12px;
  + font-size: @font-size-sm;
  line-height: 16px;
  }
  &__price-symbol {
  - font-size: 16px;
  + font-size: @font-size-lg;
  vertical-align: text-bottom;
  }
  margin-left: @padding-xs;
  padding: 0 5px;
  color: @red;
  - font-size: 12px;
  + font-size: @font-size-sm;
  line-height: 16px;
  vertical-align: middle;
  background-color: @sku-price-tag-color;
  display: inline-block;
  margin-right: @padding-xs;
  color: @gray-dark;
  - font-size: 12px;
  + font-size: @font-size-sm;
  }
  &__quota {
  display: inline-block;
  color: @red;
  - font-size: 12px;
  + font-size: @font-size-sm;
  }
  &-messages {
  &__warn-text {
  margin-top: 6px;
  - font-size: 12px;
  + font-size: @font-size-sm;
  line-height: 14px;
  }
  }
  }
  - /* sku actions */
  &-actions {
  display: flex;
  + padding: @padding-xs @padding-md;
  +
  + .van-button {
  + height: 36px;
  + font-weight: 500;
  + font-size: @font-size-md;
  + line-height: 34px;
  + border: none;
  +
  + &:first-of-type {
  + border-radius: 18px 0 0 18px;
  + }
  +
  + &:last-of-type {
  + border-radius: 0 18px 18px 0;
  + }
  +
  + &--warning {
  + background: linear-gradient(to right, #ffd01e, #ff8917);
  + }
  +
  + &--danger {
  + background: linear-gradient(to right, #ff6034, #ee0a24);
  + }
  + }
  }
  }
  