fix style

@@ -4,7 +4,7 @@
       <div class="topic-name">{{data.topicName}}</div>
       <p class="topic-desc">{{data.topicDesc}}</p>
       <div class="topic-extra">
-        <label v-show="+data.articleAmount" class="att-amount">{{data.articleAmount}}人参与讨论</label>
+        <label class="att-amount" :class="{invisible: !data.articleAmount}">{{data.articleAmount}}人参与讨论</label>
         <WidgetFollow v-if="+data.allowAttention" class="att-click-wrap" :topic-id="data.topicId" :follow="data.hasAttention" :share="share" @on-follow="onFollow"></WidgetFollow>
       </div>
     </div>
@@ -55,6 +55,17 @@ export default {
   color: #fff;
   position: relative;
 
+  &:before {
+    content: "";
+    height: 1px;
+    position: absolute;
+    top: -1px;
+    left: -10px;
+    right: -10px;
+    z-index: 1;
+    box-shadow: 0 0 160px 10px #000;
+  }
+
   .banner-main {
     height: 240px;
   }