css模拟小箭头

.pkg_filter_arrow {
  position: absolute;
  left: 47px;
  bottom: 0;
  width: 0;
  height: 0;
  border: 4px solid #fff;
  border-top: none;
  border-bottom: 4px solid #59b712;
  font-size: 0;
  line-height: 0;
  text-indent: 0;
}

就这么个原理 看什么看 起来嗨