优化频道选择页面图片

@@ -140,6 +140,10 @@
             color: #fff;
             color: #fff;
             text-align: center;
             text-align: center;
 
 
+            img {
+                width: 100%;
+            }
+
             .index-channel-list {
             .index-channel-list {
                 position: absolute;
                 position: absolute;
                 top: 50%;
                 top: 50%;