How to change default color of WPF Combobox?

Question

I want to change the color of Combobox in WPF as below. I tried changing the color with the background property of the Combobox, but the background color of the contents displayed when the combo box is clicked is changed. Is there a way to solve this by changing only my code below without using any additional styles?

<ComboBox x:Name="combo_ftpdia" Width="110" Height="20" Margin="10 5 10 0"  
                          VerticalContentAlignment="Center">  
                      
                    <!--Add Code To Change Color-->  
  
                    <ComboBoxItem Content="C:\"/>  
                    <ComboBoxItem Content="D:\"/>  
                    <ComboBoxItem Content="E:\"/>  
                </ComboBox>  

Answer 1

Get the default style of the Combobox：
In the Designer -> Right Click the ComboBox -> Edit Template -> Edit a Copy

It can be changed by modifying the default template:
208658-combobox-style.txt

<ComboBox x:Name="combo_ftpdia" Width="110" Height="20" Margin="10 5 10 0" IsEditable="True"  
                  VerticalContentAlignment="Center" Style="{StaticResource ComboBoxStyle1}" >  
            <ComboBoxItem Content="C:\"/>  
            <ComboBoxItem Content="D:\"/>  
            <ComboBoxItem Content="E:\"/>  
        </ComboBox>  

complete code：
208731-combobox-style.txt
The result:

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