SelectPicker.css

.choose{
  width: 1.5rem; height: .3rem;
  border: 1px solid #F0F0F1;
  font-size: .15rem;
  border-radius: .04rem;
  text-align: left; padding-left:.1rem;
  color:#999; box-sizing: border-box;
}
.choose:after{
   float:right;
   width: .12rem; height: .1rem;
   margin-top: .11rem; margin-right: .1rem;
   background: url('../../assets/image/icon_arrowDown.png') no-repeat;
   content:''; background-size: 100%;
}
.choose>span{
  float: none;
  color:#000;
  font-size: .15rem;
  line-height: .3rem;
}