fix: '优化消息平台图标库样式'

src/pages/platformCenter/messageManage/schemeDetail/PreviewModal.less

@@ -10,13 +10,13 @@
     border-radius: 5px;
     display: inline-block;
     margin-left: 10px;
-    background-color: #2881a1;
+    background-color: #bfbfbf;
   }
   .imgHidden {
     margin-left: 10px;
     border: none;
     display: inline-block;
-    background-color: #2881a1;
+    background-color: #bfbfbf;
   }
   .imgHidden:hover {
     margin-left: 10px;

src/pages/platformCenter/messageManage/schemeDetail/schemeDetail.less

@@ -65,10 +65,10 @@
         margin-top: 10px;
         width: 100%;
         padding: 10px;
-        height: 13rem;
+        height: 16rem;
         display: flex;
         flex-direction: column;
-        overflow: scroll;
+        overflow: hidden;
       }
       .ant-switch {
         margin-right: 0.5rem;