old_contents: import sys
  import config
  import args
  import logging
  import settings
  from window import MainWindow
  from PyQt5.QtWidgets import QApplication
  
  class App(QApplication):
  
    def __init__(self, args=None):
      logging.info('Initializing Droptopus App')
      super(App, self).__init__([config.APP_NAME])
      css = """
      MiniWindow,
      DropTitleBar {
          Background: transparent;
      }
      MainWindow {
          font-size: 12px;
          color: black;
          Background: transparent;
          color: white;
          font:12px bold;
          font-weight: bold;
          border-top-left-radius: 10px;
          border-top-right-radius: 10px;
          height: 30px;
      }
      DropTitleBar > QToolButton {
          Background: transparent;
          font-size: 11px;
      }
      DropTitleBar > QToolButton:focus {
          border: none;
          outline: none;
      }
      QLabel {
          color:white;
          Background: transparent;
      }
      EditItemForm QLabel,
      QMessageBox QLabel,
      QInputDialog QLabel {
          color: #333;
      }
      AboutDialog,
      DropTitleBar,
      DropFrame {
          Background: rgba(0,0,0,70%);
          color:white;
          font:13px ;
          font-weight:bold;
      }
      AboutDialog,
      DropTitleBar,
      DropFrame {
          border-radius: 10px;
      }
      AboutDialog QPushButton {
          background-color: gray;
      }
      AboutDialog QLabel#title {
          font-size: 16px;
          font-weight: bold;
      }
      AboutDialog QWidget {
      }
      QFrame[frameShape="4"], /* QFrame::HLine == 0x0004 */
      QFrame[frameShape="5"]  /* QFrame::VLine == 0x0005 */
      {
      }
      DropWidget {
          background-color: rgba(0,0,0,0%);
      }
      DropWidget[draggedOver=true],
      DropWidget[hover=true] {
          background-color: rgba(0,0,0,50%);
      }
      """
      self.setStyleSheet(css) 
      self.mainWindow = MainWindow()
      self.mainWindow.show();
  
  
new_contents: import sys
  import config
  import args
  import logging
  import settings
  from window import MainWindow
  from PyQt5.QtWidgets import QApplication
  
  class App(QApplication):
  
    def __init__(self, args=None):
      logging.info('Initializing Droptopus App')
      super(App, self).__init__([config.APP_NAME])
      css = """
      MiniWindow,
      DropTitleBar {
          Background: transparent;
      }
      MainWindow {
          font-size: 12px;
          color: black;
          Background: transparent;
          color: white;
          font:12px bold;
          font-weight: bold;
          border-top-left-radius: 10px;
          border-top-right-radius: 10px;
          height: 30px;
      }
      DropTitleBar > QToolButton {
          Background: transparent;
          font-size: 11px;
      }
      DropTitleBar > QToolButton:focus {
          border: none;
          outline: none;
      }
      QLabel {
          color:white;
          Background: transparent;
      }
      EditItemForm QLabel,
      QMessageBox QLabel,
      QInputDialog QLabel {
          color: #333;
      }
      AboutDialog,
      DropTitleBar,
      DropFrame {
          Background: rgba(0,0,0,70%);
          color:white;
          font:13px ;
          font-weight:bold;
      }
      AboutDialog,
      DropTitleBar,
      DropFrame {
          border-radius: 10px;
      }
      AboutDialog QPushButton {
          background-color: gray;
      }
      AboutDialog QLabel#title {
          font-size: 16px;
          font-weight: bold;
      }
      DropWidget {
          background-color: rgba(0,0,0,0%);
      }
      DropWidget[draggedOver=true],
      DropWidget[hover=true] {
          background-color: rgba(255,255,255,5%);
      }
      """
      self.setStyleSheet(css) 
      self.mainWindow = MainWindow()
      self.mainWindow.show();
  
  
subject: Tweak QSS