private void ApplyDarkTheme()
 {
     this.BackColor = DarkTheme.BackgroundColour();
     DarkTheme.GroupBoxes(grbOptions);
     DarkTheme.Labels(lblEntropy);
     DarkTheme.Labels(lblPassword);
     DarkTheme.Labels(lblLength);
     DarkTheme.TextBoxes(txtGeneratedPassword);
     DarkTheme.Buttons(btnRegeneratePassword);
     DarkTheme.Buttons(btnCopyPassword);
     DarkTheme.ComboBoxes(cmbGenerateType);
     DarkTheme.NumericUpDown(nudLength);
     DarkTheme.CheckBoxes(chkLowercase);
     DarkTheme.CheckBoxes(chkUppercase);
     DarkTheme.CheckBoxes(chkNumbers);
     DarkTheme.CheckBoxes(chkSymbols);
 }