Update app.R

app.R

@@ -10,6 +10,7 @@ library(rnaturalearth)
 library(rnaturalearthdata)
 library(countrycode)
 library(leaflet)     # <-- For OpenStreetMap-based map
+library(viridisLite)
 
 # =============================
 #            UI
@@ -283,7 +284,7 @@ server <- function(input, output, session) {
     
     # Build a color palette based on the chosen index
     pal <- colorNumeric(
-      palette = "viridis",
+      palette = viridisLite::viridis(256, begin = 0, end = 0.80),
       domain = plot_data[[index_col]],
       na.color = "white"
     )
@@ -338,8 +339,8 @@ server <- function(input, output, session) {
       clearControls() %>%  # clear existing legends
       addPolygons(
         fillColor = ~pal(get(index_col)),
-        fillOpacity = 0.7,
-        color = "grey20",
+        fillOpacity = 0.95,
+        color = "gray",
         weight = 0.4,
         layerId = ~iso_a3,
         label = labels,