min-height:160px

@@ -116,9 +116,10 @@
         .stu-rights-item .item-content {
             position: absolute;
             top: 0;
+            min-height: 160px;
             padding: 20px;
             margin-top: 0;
-            transition: margin-top 2s linear;
+            transition: margin-top 2.5s linear;
             background: rgba(255,255,255,.95);
         }