奖品占位居中

src/components/activity/newyear-2019/common/prizes/prizes.scss

@@ -116,6 +116,12 @@
             }
         }
 
+        & li:last-child{
+            display: flex;
+            align-items: center;
+            justify-content: center;
+        }
+
         .top-tag {
             position: absolute;
             top: 0;