样式

src/components/app-select-tree-list/app-select-tree-list.less

-.app-select-tree-list{
-    font-size: 14px;
-    .app-select-tree-list-item {
-        display: flex;
-        justify-content: space-between;
-        padding: 10px 20px;
-        border-bottom: solid #efefef .2px;
-        align-items: center;
-        .header {
-            display: flex;
-            justify-content: center;
-            align-items: center;
-        }
-        .delete {
-            color: #f85b46;
-            
-        }
-        .index_text {
-            width: 30px;
-            height: 30px;
-            background: #ccc;
-            margin-right: 10px;
-            text-align: center;
-            line-height: 30px;
-            border-radius: 4px;
-        }
+.app-select-tree-list {
+  margin-top: 20px;
+  font-size: 14px;
+  .app-select-tree-list-item {
+    display: flex;
+    justify-content: space-between;
+    padding: 10px 20px;
+    border-bottom: solid #efefef 0.2px;
+    align-items: center;
+    .app-select-tree-list-item-header {
+      display: flex;
+      justify-content: center;
+      align-items: center;
     }
-}
+    .delete {
\ No newline at end of file
+      color: #f85b46;
+    }
+    .index_text {
+      width: 30px;
+      height: 30px;
+      background: #ccc;
+      margin-right: 10px;
+      text-align: center;
+      line-height: 30px;
+      border-radius: 4px;
+    }
+  }
+}
+.ibiz_sheet_tree {
+  height: 60vh;
+  .header {
+    position: absolute;
+    width: 100%;
+    margin: 0 auto;
+    height: 20px;
+    background: #fff;
+  }
+}

src/components/app-select-tree-list/app-select-tree-list.vue

 <template>
   <div class="app-select-tree-list">
     <div v-for="item in items" :key="item.srfkey" class="app-select-tree-list-item" >
-      <div class="header">
+      <div class="app-select-tree-list-item-header">
         <div class="index_text">{{getindexText(item.srfmajortext)}}</div>
         <div class="text">{{item.srfmajortext}}</div>
       </div>

src/styles/theme/theme.less

@@ -260,6 +260,20 @@
     --color: @theme-color;
     --color-activated: @theme-color;
   }
+
+  .app-select-tree-list {
+    .app-select-tree-list-item {
+      .index_text {
+        background: @theme-color;
+        color: @text-color;
+      }
+    }
+  }
+  .app-mob-treeview .tree_item_label .tree_item_index_text {
+    background: @theme-color;
+    color: @text-color;
+  }
+
   // 用户自定义主题文件
-  .user_theme(@theme-color,@text-color);
+  .user_theme(@theme-color, @text-color);
 }