weex nvue界面里面cell继承父级的宽度，cell不能自适应最里面子级的宽度

      <cover-view class="coverview" style="overflow-y:scroll;" v-if="viewCon" :scroll-top="40">  
              <list class="list uni-column" :show-scrollbar="false" @scroll="scrollclick" >  
                <cell v-for="(item,index) in commList" :key="index" :ref="'item' + index" class="cell" >  
                    <view class="panel uni-row" ref="panwidth">  
                        <image class="img2" :src="item.avatar"></image>  
                        <view class="concom uni-row def" >  
                            <text >{{item.nickname}}</text>  
                            <text >{{item.message_content}}</text>  
                        </view>  
                    </view>  
                </cell>  
              </list>  
          </cover-view>  
.coverview {  
    position: absolute;  
    left: 0;  
    right: 0;  
    bottom: 0;  
    height: 350rpx;   
    width:800rpx;  
}  
.panel{  
       background-color: rgba(0, 0, 0, 0.8);  
    padding: 10rpx 30rpx;  
    border-radius: 50rpx;  
    margin-bottom: 10rpx;  
}

cell 的总宽度一直等于coverview 最外层的宽度，而没有和里面文字的宽度保持一致。请问改怎么写样式，才能让cell自适应子集的宽度呢？我怎么设置都不生效