fix(widget): make resize handles more visible

Author: Guillaume Chau

packages/@vue/cli-ui/src/style/main.styl

@@ -208,10 +208,7 @@ ansi-colors('white', $vue-ui-color-light)
   width 12px
   height @width
   border-radius 50%
-  background lighten($vue-ui-color-primary, 40%)
-  .vue-ui-dark-mode &
-    background darken($vue-ui-color-primary, 40%)
-
+  background $vue-ui-color-primary
 
   $halfWidth = @width / 2
   $halfHeight = @height / 2