diff --git a/main.go b/main.go
index 0f210be..339185a 100644
--- a/main.go
+++ b/main.go
@@ -126,6 +126,7 @@ func serveTracking() http.HandlerFunc {
 		totalVisitorsLabels, totalVisitorsDps, sessionsDps, bouncesDps := tracking.GetTotalVisitors(startDate, endDate)
 		hourlyVisitorsTodayLabels, hourlyVisitorsTodayDps := tracking.GetHourlyVisitorsToday()
 		pageVisitors, pageRank := tracking.GetPageVisits(startDate, endDate)
+		timeOfDay, timeOfDayMax := tracking.GetVisitorTimeOfDay(startDate, endDate)
 		tplCache.RenderWithoutCache(w, "tracking.html", struct {
 			Start                     int
 			StartDate                 time.Time
@@ -143,6 +144,7 @@ func serveTracking() http.HandlerFunc {
 			Countries                 []pirsch.CountryStats
 			Platform                  *pirsch.VisitorStats
 			TimeOfDay                 []pirsch.TimeOfDayVisitors
+			TimeOfDayMax              float64
 			HourlyVisitorsTodayLabels template.JS
 			HourlyVisitorsTodayDps    template.JS
 			ActiveVisitors            int
@@ -163,7 +165,8 @@ func serveTracking() http.HandlerFunc {
 			tracking.GetOS(startDate, endDate),
 			tracking.GetCountry(startDate, endDate),
 			tracking.GetPlatform(startDate, endDate),
-			tracking.GetVisitorTimeOfDay(startDate, endDate),
+			timeOfDay,
+			float64(timeOfDayMax),
 			hourlyVisitorsTodayLabels,
 			hourlyVisitorsTodayDps,
 			activeVisitors,
diff --git a/template/tracking.html b/template/tracking.html
index f6a288e..018fb4d 100644
--- a/template/tracking.html
+++ b/template/tracking.html
@@ -242,7 +242,10 @@
                 <tr>
                     <td>{{$i}}</td>
                     {{range $j, $day := $global.TimeOfDay}}
-                        <td>{{(index (index $global.TimeOfDay $j).Stats $i).Visitors}}</td>
+                        {{$visitors := float64 (index (index $global.TimeOfDay $j).Stats $i).Visitors}}
+                        <td style="background: rgba(81, 81, 81, {{divide $visitors $global.TimeOfDayMax}});color: #fff;text-align: center;">
+                            {{$visitors}}
+                        </td>
                     {{end}}
                 </tr>
             {{end}}
diff --git a/tpl/template.go b/tpl/template.go
index 60cd339..402c38f 100644
--- a/tpl/template.go
+++ b/tpl/template.go
@@ -38,9 +38,11 @@ func (cache *Cache) load() {
 	funcMap := template.FuncMap{
 		"slug":     slug.Make,
 		"format":   func(t time.Time, layout string) string { return t.Format(layout) },
-		"multiply": func(f, x float64) float64 { return f * x },
+		"multiply": func(a, b float64) float64 { return a * b },
+		"divide":   func(a, b float64) float64 { return a / b },
 		"round":    func(f float64) string { return fmt.Sprintf("%.2f", f) },
 		"intRange": intRange,
+		"float64":  func(i int) float64 { return float64(i) },
 	}
 	var err error
 	cache.tpl, err = template.New("").Funcs(funcMap).ParseGlob(templateDir)
diff --git a/tracking/statistics.go b/tracking/statistics.go
index 6e3980b..9fd1594 100644
--- a/tracking/statistics.go
+++ b/tracking/statistics.go
@@ -161,7 +161,7 @@ func GetPlatform(startDate, endDate time.Time) *pirsch.VisitorStats {
 	return analyzer.Platform(&pirsch.Filter{From: startDate, To: endDate})
 }
 
-func GetVisitorTimeOfDay(startDate, endDate time.Time) []pirsch.TimeOfDayVisitors {
+func GetVisitorTimeOfDay(startDate, endDate time.Time) ([]pirsch.TimeOfDayVisitors, int) {
 	min := endDate.Add(-time.Hour * 24 * 7)
 
 	if startDate.Before(min) {
@@ -172,10 +172,20 @@ func GetVisitorTimeOfDay(startDate, endDate time.Time) []pirsch.TimeOfDayVisitor
 
 	if err != nil {
 		logbuch.Error("Error reading visitor time of day statistics", logbuch.Fields{"err": err})
-		return nil
+		return nil, 0
 	}
 
-	return visitors
+	maxVisitors := 0
+
+	for _, v := range visitors {
+		for _, s := range v.Stats {
+			if maxVisitors < s.Visitors {
+				maxVisitors = s.Visitors
+			}
+		}
+	}
+
+	return visitors, maxVisitors
 }
 
 func sumVisitors(stats []pirsch.Stats) int {