diff --git a/src/charttheme.cpp b/src/charttheme.cpp
index 67c2af9..6ecb82f 100644
--- a/src/charttheme.cpp
+++ b/src/charttheme.cpp
@@ -157,7 +157,9 @@ void ChartTheme::decorate(BarPresenter* item, QBarSeries* series,int count)
 {
     QList<QBarSet*> sets = series->barSets();
     for (int i=0; i<sets.count(); i++) {
-        qreal pos = (qreal) i / (qreal) sets.count();
+        qreal pos = 0.5;
+        if (sets.count() > 1)
+            pos = (qreal) i / (qreal) (sets.count() - 1);
         QColor c = colorAt(m_seriesGradients.at(count % m_seriesGradients.size()), pos);
         sets.at(i)->setBrush(QBrush(c));
 
@@ -177,7 +179,9 @@ void ChartTheme::decorate(StackedBarPresenter* item, QStackedBarSeries* series,i
 {
     QList<QBarSet*> sets = series->barSets();
     for (int i=0; i<sets.count(); i++) {
-        qreal pos = (qreal) i / (qreal) sets.count();
+        qreal pos = 0.5;
+        if (sets.count() > 1)
+            pos = (qreal) i / (qreal) (sets.count() - 1);
         QColor c = colorAt(m_seriesGradients.at(count % m_seriesGradients.size()), pos);
         sets.at(i)->setBrush(QBrush(c));
 
@@ -194,7 +198,9 @@ void ChartTheme::decorate(PercentBarPresenter* item, QPercentBarSeries* series,i
 {
     QList<QBarSet*> sets = series->barSets();
     for (int i=0; i<sets.count(); i++) {
-        qreal pos = (qreal) i / (qreal) sets.count();
+        qreal pos = 0.5;
+        if (sets.count() > 1)
+            pos = (qreal) i / (qreal) (sets.count() - 1);
         QColor c = colorAt(m_seriesGradients.at(count % m_seriesGradients.size()), pos);
         sets.at(i)->setBrush(QBrush(c));
 
diff --git a/src/themes/chartthemescientific_p.h b/src/themes/chartthemescientific_p.h
index d6c486a..8115ee5 100644
--- a/src/themes/chartthemescientific_p.h
+++ b/src/themes/chartthemescientific_p.h
@@ -7,25 +7,12 @@ class ChartThemeScientific: public ChartTheme
 public:
     ChartThemeScientific():ChartTheme(QChart::ChartThemeScientific)
     {
-        m_seriesColors << QRgb(0xFF000000);
         m_seriesColors << QRgb(0xFFFFAD00);
         m_seriesColors << QRgb(0xFF596A75);
+        m_seriesColors << QRgb(0xFF202020);
         m_seriesColors << QRgb(0xFF474747);
 
-        QLinearGradient g1;
-        g1.setColorAt(0.0, m_seriesColors.at(0));
-        g1.setColorAt(1.0, m_seriesColors.at(1));
-        m_seriesGradients << g1;
-
-        QLinearGradient g2;
-        g2.setColorAt(0.0, m_seriesColors.at(1));
-        g2.setColorAt(1.0, m_seriesColors.at(2));
-        m_seriesGradients << g2;
-
-        QLinearGradient g3;
-        g3.setColorAt(0.0, m_seriesColors.at(2));
-        g3.setColorAt(1.0, m_seriesColors.at(3));
-        m_seriesGradients << g3;
+        generateSeriesGradients();
 
         QLinearGradient backgroundGradient;
         backgroundGradient.setColorAt(0.0, QRgb(0xffafafaf));