select下拉框右对齐，去掉箭头，替换箭头

右对齐

select{
   width:auto;
   direction: rtl;
}
select option {
　　direction: ltr;
}

去掉箭头（不设置背景色会有灰色背景）

select{
   appearance:none;
   -moz-appearance:none;
   -webkit-appearance:none;
   background-color: #fff;
   /*设置箭头*/
   background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAJCAYAAAAGuM1UAAAAH0lEQVR42mNgoDnQ13f7TwiTpIkkm0hyHkl+YhhQAABcfyjsqSyTLgAAAABJRU5ErkJggg==") no-repeat scroll right center transparent;
   padding-right: 14px;
}

清除ie的默认选择框样式，隐藏下拉箭头

select::-ms-expand {
   display: none;
}