小程序 去掉button的灰色的边框

未去掉前

未去掉前.jpg

去掉后

去掉后.jpg

代码

<view class="footer">
  <view class="toLead">
    <form name='pushMsgFm' report-submit bindsubmit='agree' class='fromdiv'>
      <button form-type="submit" class='btn'>同意</button>
    </form>
  </view>

  <view class="toLead" >
    <form name='pushMsgFm' report-submit bindsubmit='disagree' class='fromdiv'>
      <button form-type="submit"  class='btn'>不同意</button>
    </form>
  </view>
</view>

button[class="btn"]::after {
  background: transparent;
  background-color: transparent;
  margin: 0;
  padding: 0;
  border: 0;
  outline: none;
} 

.btn{
 background: white;
}