diff --git a/svg.cpp b/svg.cpp
index f404978..8dd2c79 100644
--- a/svg.cpp
+++ b/svg.cpp
@@ -40,7 +40,7 @@ void show_histogram_svg(const std::vector<size_t>& bins){
     svg_end();
 }
 
-void svg_rect(double x, double y, double width, double height){
-    std::cout << "<rect x='" << x << "' y='" << y << "' width='" << width << "' height='" << height << "' stroke='red' fill='#ffeeee' />";
+void svg_rect(double x, double y, double width, double height, std::string stroke, std::string fill){
+    std::cout << "<rect x='" << x << "' y='" << y << "' width='" << width << "' height='" << height << "' stroke='" << stroke << "' fill='" << fill << "' />";
 }
 
diff --git a/svg.h b/svg.h
index 5dc97d6..2340485 100644
--- a/svg.h
+++ b/svg.h
@@ -7,6 +7,6 @@ void svg_begin(double width, double height);
 void svg_end();
 void show_histogram_svg(const std::vector<size_t>& bins);
 void svg_text(double left, double baseline, std::string text);
-void svg_rect(double x, double y, double width, double height);
+void svg_rect(double x, double y, double width, double height, std::string stroke = "black", std::string fill = "black");
 
 #endif // SVG_H_INCLUDED