diff --git a/README.md b/README.md
index 7c7d805..177de99 100644
--- a/README.md
+++ b/README.md
@@ -33,12 +33,12 @@ p1 <- ggplot(mtcars, aes(x = brand, fill = carb)) +
   facet_wrap(vars(am, vs, gear), strip.position = "top", scales = "free_x", nrow = 1) +
   theme_bw(base_size = 15) +
   theme(panel.spacing = unit(0, "lines"),
-        strip.background = element_rect(color = "black", size = 0, fill = "grey92"),
+        strip.background = element_rect(color = "black", size = 0.1, fill = "grey92"),
         strip.placement = "outside",
         axis.text.x = element_text(angle = 90, hjust = 1, vjust = 0.3),
         panel.grid.major = element_blank(),
         panel.grid.minor = element_line(colour = "grey"),
-        panel.border = element_rect(color = "black", fill = NA, size = 0),
+        panel.border = element_rect(color = "black", fill = NA, size = 0.1),
         panel.background = element_rect(fill = "white"))
 
 # show/save base ggplot2 bar chart
@@ -52,4 +52,4 @@ ggsave("p1.png", width = 20, height = 5)
 (p2 <- ggNestedBarChart(p1))
 ggsave("p2.png", width = 20, height = 5)
 ```
-![ggNestedBarChart Example](p2.png?raw=true "ggNestedBarChart Example")
\ No newline at end of file
+![ggNestedBarChart Example](p2.png?raw=true "ggNestedBarChart Example")