diff --git a/R/demoMap.R b/R/demoMap.R
index 4a90669..5b3c16a 100644
--- a/R/demoMap.R
+++ b/R/demoMap.R
@@ -11,7 +11,7 @@
 ##' @examples
 ##' demomap("china")
 ##' @export
-demomap = function(mapName){
+demomap = function(mapName, opacity=0.2){
   # if(.Platform$OS.type == "windows"){
   #   locate = Sys.getlocale("LC_CTYPE")
   #   Sys.setlocale("LC_CTYPE","eng")
@@ -30,8 +30,10 @@ demomap = function(mapName){
   output = map %>% leaflet::addTiles() %>%
     leaflet::addPolygons(stroke = T,
                 smoothFactor = 0.2,
-                fillOpacity = 0.2,
-                # fillColor = ~color,
+                fillOpacity = opacity,
+                fillColor = 'grey',
+                color = 'white',
+                opacity = 1,
                 weight = 1,
                 popup = ~htmltools::htmlEscape(popup))
 #
diff --git a/man/demomap.Rd b/man/demomap.Rd
index 2390519..b8b0d50 100644
--- a/man/demomap.Rd
+++ b/man/demomap.Rd
@@ -8,6 +8,7 @@ demomap (mapName)
 }
 \arguments{
 \item{mapName}{mapName for loading, eg. 'china', 'city', ...}
+\item{opacity}{opacity for polygons}
 }
 \description{
 This function create a leaflet map from a name of the mapType like china, city