diff --git a/qucs-activefilter/qucsactivefilter.cpp b/qucs-activefilter/qucsactivefilter.cpp
index 341cf525..1e7323f0 100644
--- a/qucs-activefilter/qucsactivefilter.cpp
+++ b/qucs-activefilter/qucsactivefilter.cpp
@@ -222,8 +222,9 @@ QucsActiveFilter::QucsActiveFilter(QWidget *parent)
     QSize sz;
     QString s1 = ":/images/bitmaps/AFR.svg";
     imgAFR = new QSvgWidget(s1);
+    imgAFR->setStyleSheet("background-color: white;");
     sz = gpbPar->size(); // take left box size as reference size
-    sz *= 0.6;
+    sz *= 0.75;
     imgAFR->setFixedSize(sz);
     vl1->addWidget(imgAFR);
     vl1->setAlignment(imgAFR, Qt::AlignHCenter);
@@ -234,6 +235,7 @@ QucsActiveFilter::QucsActiveFilter(QWidget *parent)
     gpbSCH->setLayout(vl2);
     s1 = ":/images/bitmaps/cauer.svg";
     sch_pic = new QSvgWidget(s1);
+    sch_pic->setStyleSheet("background-color: white;");
     sz = gpbFunc->size(); // take lefbox size as reference size
     sz *= 0.95;
     sch_pic->setFixedSize(sz);
diff --git a/qucs-attenuator/qucsattenuator.cpp b/qucs-attenuator/qucsattenuator.cpp
index 68ec7af0..401bc210 100644
--- a/qucs-attenuator/qucsattenuator.cpp
+++ b/qucs-attenuator/qucsattenuator.cpp
@@ -97,6 +97,7 @@ QucsAttenuator::QucsAttenuator()
   topoGrid->addWidget(ComboTopology, 1,0,1,2);
 
   pixTopology = new QLabel(TopoGroup);//====================Pixmap for Topology
+  pixTopology->setStyleSheet("background-color: white;");
   pixTopology->setPixmap(QPixmap((":/bitmaps/att_pi.png")));
   topoGrid->addWidget(pixTopology,2,0,3,2);
 
diff --git a/qucs-powercombining/qucspowercombiningtool.cpp b/qucs-powercombining/qucspowercombiningtool.cpp
index 72d65469..0786bd32 100644
--- a/qucs-powercombining/qucspowercombiningtool.cpp
+++ b/qucs-powercombining/qucspowercombiningtool.cpp
@@ -280,6 +280,7 @@ QucsPowerCombiningTool::QucsPowerCombiningTool()
    QString s1 = ":/bitmaps/Wilkinson_idealTL.svg";
    QGridLayout * imgLayout = new QGridLayout();
    imgWidget = new QSvgWidget(s1);
+   imgWidget->setStyleSheet("background-color: white;");
    sz = imgWidget->size();
    imgWidget->setFixedSize(.6*sz);
    imgLayout->addWidget(imgWidget);