展览详情页：优化返回按钮样式

src/views/ExhibitionDetail.vue

@@ -331,9 +331,11 @@ export default {
     }
     .close {
       position: fixed;
-      top: 1.34rem;
-      left: 0.91rem;
+      top: 0.84rem;
+      left: 0.41rem;
       width: 0.63rem;
+      padding: 0.5rem;
+      cursor: pointer;
     }
     h2 {
       font-size: 0.91rem;