chore: Fix style lint

components/select/style/index.less

@@ -9,8 +9,8 @@
 @select-height-without-border: @input-height-base - 2 * @border-width-base;
 
 .select-selector() {
-  background-color: @select-background;
   position: relative;
+  background-color: @select-background;
   border: @border-width-base @border-style-base @select-border-color;
   border-radius: @border-radius-base;
   transition: all 0.3s @ease-in-out;