diff --git a/GUI/View/PlotUtil/ColorMap.cpp b/GUI/View/PlotUtil/ColorMap.cpp
index 50bce5d1c78ed897a85ec0a481090c914b4dace1..3aacef46a725d13e291b1bb585de0388b01a5efa 100644
--- a/GUI/View/PlotUtil/ColorMap.cpp
+++ b/GUI/View/PlotUtil/ColorMap.cpp
@@ -68,6 +68,7 @@ ColorMap::ColorMap(QWidget* parent)
     connect(m_qcp, &QCustomPlot::afterReplot, this, &ColorMap::marginsChangedNotify);
 
     auto* vlayout = new QVBoxLayout(this);
+    vlayout->setContentsMargins(0, 0, 0, 0); // essential for matching idealized and pixelized maps
     vlayout->setSpacing(0);
     vlayout->addWidget(m_qcp);
     setLayout(vlayout);