message: chore: minus css var
diff: border-top-color: currentColor;
  border-bottom-width: 0;
  transform: translate(-50%, 0%);
  - margin-bottom: calc(0px - var(--van-popover-arrow-size));
  + margin-bottom: calc(var(--van-popover-arrow-size) * -1);
  }
  }
  border-right-width: 0;
  border-left-color: currentColor;
  transform: translate(0%, -50%);
  - margin-right: calc(0px - var(--van-popover-arrow-size));
  + margin-right: calc(var(--van-popover-arrow-size) * -1);
  }
  }
  border-right-color: currentColor;
  border-left-width: 0;
  transform: translate(0%, -50%);
  - margin-left: calc(0px - var(--van-popover-arrow-size));
  + margin-left: calc(var(--van-popover-arrow-size) * -1);
  }
  }
  border-top-width: 0;
  border-bottom-color: currentColor;
  transform: translate(-50%, 0%);
  - margin-top: calc(0px - var(--van-popover-arrow-size));
  + margin-top: calc(var(--van-popover-arrow-size) * -1);
  }
  }
  