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JScrollPane with transparent background and content

In my application, I show a popup dialog to show a large list of cards. I show them as images in many components JLabelin a subclass JPanel. Then I put this object in JScrollPaneto allow horizontal scrolling across the maps.

I want the unused space to be transparent with a dark background to show what is turned off behind it. I used setBackground(new Color(50, 50, 50, 200))to achieve the look that I want, but the content behind it does not redraw, so I get artifacts.

Here's what it looks like:

Artifacting when scrolling

How can i fix this? How can I get the content to redraw it while scrolling?

Thanks in advance.

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JScrollPane JViewport, . , , - , .

, setOpaque(false) .

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, paintComponent (, )

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    jScrollPane.getVerticalScrollBar().addAdjustmentListener(new AdjustmentListener() {
        @Override
        public void adjustmentValueChanged(final AdjustmentEvent e) {
            sevenWondersframe.repaint();
        }
    });
    jScrollPane.getHorizontalScrollBar().addAdjustmentListener(new AdjustmentListener() {
        @Override
        public void adjustmentValueChanged(final AdjustmentEvent e) {
            sevenWondersframe.repaint();
        }
    });
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