core Parallax overlay

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Hi
Looking for a way to add an overlay on the core parallax template to give a darkened affect on the image.

blocks/core_area_layout/templates/parallax/view.php shows the following
<div data-stripe-wrapper="parallax" data-background-image="<?php echo $background ?>">
    <?php
    foreach ($columns as $column) {
        $html = $column->getColumnHtmlObject();
        $container->appendChild($html);
    }
    print $container;
    ?>


but does not allow me to insert a separate div between the ccm-block-custom-template-parallax and the parallax-stripe-inner where it becomes a container.

I tried to use parallax-image-container but this contains the image so will ignore a background-color: rgba(0, 0, 0, 0.65);

any help appreciated

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