Gallery and Slider blocks not working with dark mode

Hello!

The Post Carousel (with background image) and Gallery Spectra blocks don’t work with dark mode on my website.

• The dark mode css is very simple (just sets the background color to dark gray for the body class). (see below)
• This works perfectly for regular images (both wordpress default and spectra image blocks) as well as default WordPress galleries, but not for Spectra galleries or sliders. Image: https://i.imgur.com/JPFWmzF.jpg
• I’ve tried overwriting the background color for specific Spectra elements (.spectra-image-gallery__media-thumbnail-caption, .spectra-image-gallery__media-thumbnail-caption–overlay) through the :not modifier in my style sheet as well as the additional CSS option in WordPress, neither one helped.

Any ideas of what I can do to fix this?

body.nm_active,
body.nm_active *,
body.nm_active ::after {
    background-color: #1c1b1b !important;
    color: #d3d3d3 !important;
    border-color: #d3d3d3 !important;
}