用户管理页面样式优化

src/app/system-management/user/user.component.scss

@@ -10,6 +10,8 @@
 
   .treebox {
   display: flex;
+  flex: 1;
+  overflow: auto;
   flex-direction: column;
   }
   .topbox2 {
@@ -33,6 +35,7 @@
     .righttop {
       height: 36px;
       display: flex;
+      margin-right: 10px;
       width: 200px;
       button {
         margin-left: 16px;