箭头

.errBox{font-size: 12px;position: absolute;top:40px;color: #ff0000;border:1px solid #ff0000;width:120px;line-height:22px;text-align:center;background-color: #ffffff;z-index: 1;
}
.errBox::after{width: 8px;height: 8px;border-top: 1px solid #ff0000;border-right: 1px solid #ff0000;transform: rotate(-45deg);content: '';position: absolute;top: -5px;left:55px;z-index: 1;background-color: #ffffff;
}