select#xyz {
   border:0px;
   outline:0px;
}

你不能完全风格,但你可以尝试像

select#xyz {
  -webkit-appearance: button;
  -webkit-border-radius: 2px;
  -webkit-Box-shadow: 0px 1px 3px rgba(0,0.1);
  -webkit-padding-end: 20px;
  -webkit-padding-start: 2px;
  -webkit-user-select: none;
  background-image: url(../images/select-arrow.png),-webkit-linear-gradient(#FAFAFA,#F4F4F4 40%,#E5E5E5);
  background-position: center right;
  background-repeat: no-repeat;
  border: 1px solid #AAA;
  color: #555;
  font-size: inherit;
  margin: 0;
  overflow: hidden;
  padding-top: 2px;
  padding-bottom: 2px;
  text-overflow: ellipsis;
  white-space: nowrap;
}