diff --git a/svg.cpp b/svg.cpp
index 19eb452..13e3106 100644
--- a/svg.cpp
+++ b/svg.cpp
@@ -32,8 +32,15 @@ void show_histogram_svg(const vector<size_t>& bins) {
     double top = 0;
     const size_t MAX_ASTERISK = IMAGE_WIDTH - TEXT_WIDTH;
     svg_begin(IMAGE_WIDTH,IMAGE_HEIGHT);
-    double top = 0;
 
+    double max_count;
+    max_count = bins[0];
+    for (double x : bins) {
+        if (x > max_count) {
+            max_count = x;
+        }
+    }
+    string fill;
     size_t maxbin=bins[0];
     for (size_t i=0; i < bins.size(); i++){
         if (maxbin < bins[i]){
@@ -45,7 +52,8 @@ void show_histogram_svg(const vector<size_t>& bins) {
         for (size_t i=0; i < bins.size(); i++) {
             double bin_width = BLOCK_WIDTH * bins[i];
             svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bins[i]));
-            svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT);
+            fill = "#" + to_string(int(10 - (bins[i] * 9) / max_count))+ to_string(int(10 - (bins[i] * 9) / max_count))+ to_string(int(10 - (bins[i] * 9) / max_count));
+            svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, "black", fill);
             top += BIN_HEIGHT;
         }
         svg_end();
@@ -53,7 +61,8 @@ void show_histogram_svg(const vector<size_t>& bins) {
         for (size_t i=0; i < bins.size(); i++) {
             double bin_width= MAX_ASTERISK * (static_cast<double>(bins[i]) / maxbin);
             svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bins[i]));
-            svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT);
+            fill = "#" + to_string(int(10 - (bins[i] * 9) / max_count))+ to_string(int(10 - (bins[i] * 9) / max_count))+ to_string(int(10 - (bins[i] * 9) / max_count));
+            svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, "black", fill);
             top += BIN_HEIGHT;
         }
     }