css覆盖select样式并添加小箭头

.select {
    border-radius: 5px;
    border: 1px #F4A627 solid;
    -webkit-appearance: none;//清除默认样式
    background: url("../assets/select.png") no-repeat scroll right center transparent;
    padding: 5px 14px 5px 5px;
  }