diff --git a/src/utils/base/__pycache__/base.cpython-310.pyc b/src/utils/base/__pycache__/base.cpython-310.pyc
index 5e849e1..ae58136 100644
Binary files a/src/utils/base/__pycache__/base.cpython-310.pyc and b/src/utils/base/__pycache__/base.cpython-310.pyc differ
diff --git a/src/utils/base/base.py b/src/utils/base/base.py
index 54bb002..cf016df 100644
--- a/src/utils/base/base.py
+++ b/src/utils/base/base.py
@@ -254,7 +254,7 @@ class BasePlotWidget:
                 x_downsampled, y_downsampled = self._downsample_data(x, y, max_points=1000)
                 navigator.plot(x_downsampled, y_downsampled, pen=signal["pen"], name=signal["name"])
 
-        ROI_region = pg.LinearRegionItem(values=time_region, movable=True, brush=pg.mkBrush(0, 0, 255, 100))
+        ROI_region = pg.LinearRegionItem(values=time_region, movable=True, brush=pg.mkBrush(0, 0, 255, 100), pen=pg.mkPen(width=4))
         ROI_region.setBounds([0, x.iloc[-1]])
         navigator.addItem(ROI_region)
         navigator.getPlotItem().getViewBox().setLimits(xMin=0, xMax=x.iloc[-1])