无上边框按钮

 margintop上移，边框颜色设置成一样的，border-top设置成none，background设置成页面底色覆盖掉上面的border

.goodsDiffer .nobrdr a {
  height: 27px;
  line-height: 27px;
  margin: 0;
  display: inline-block;
  padding: 0 29px;
  border: 2px solid #f7f7f8;
  border-top: none;
  margin-top: -2px;
  background: #ffffff;
  color: #5b5b5b;
  font-size: 12px;
}