Remove slideshow title background

Site URL: https://espacedesign.squarespace.com/

Hi, I have a slideshow gallery on my site https://espacedesign.squarespace.com/ (password: espace) and the title and body text on the images have a dark grey background. I don't want a background, I want it to be transparent and just have text on the image. I tried several codes but none of them seem to do the job. I also don't find this option in the settings. Can anyone help with this?

Add to Design > Custom CSS

/* Gallery caption transparent */
.sqs-gallery-block-slideshow.sqs-gallery-block-show-meta .sqs-active-slide .meta {
	background-color: transparent !important;
}