style：省市县区组件样式

src/web/staticres/css/selector/selector.css

@@ -521,6 +521,7 @@
   background:#F5F6F7;
   color: #1d1d1d;
   border: 1px solid#ececec;
+  font-size: 14px;
 }
 .area-city-country .el-tag:hover{
   color: #2ABED1;
@@ -600,4 +601,7 @@
 }
 .area-city-country .count-value{
   color: #1d1d1d;
+}
+.area-city-country .select--result::-webkit-scrollbar{
+  width: 4px;
 }