Experiment with changing styles.

main.py

@@ -7,6 +7,9 @@ import time
 import webbrowser
 
 from PySide2.QtCore import QObject, QThread, Signal, Slot
+
+from PySide2.QtGui import QPalette, QColor
+
 from PySide2.QtWidgets import (
     QApplication,
     QDialog,
@@ -48,6 +51,11 @@ class Dialog(QDialog):
     def __init__(self):
         super(Dialog, self).__init__()
 
+        palette = self.palette()
+        palette.setColor(QPalette.Window, QColor(255, 255, 255))
+        self.setPalette(palette)
+        self.setAutoFillBackground(True)
+
         self.setWindowTitle("OrgEditor")
         scrSize = self.screen().size()
         self.resize(scrSize.width() / 1.5, scrSize.height() / 1.5)
@@ -156,7 +164,7 @@ class Dialog(QDialog):
 
     def build_agenda_task_widget(self, item):
         box = QHBoxLayout()
-        frame = QGroupBox()
+        frame = QFrame()
         frame.setLayout(box)
 
         state_button = QPushButton(text=f"{item.state or '-'}", maximumWidth=60)