Hi there,
that CSS will remove a Background Overlay from any Section that you add the no-mobile-bg-overlay
CSS class to in the Elementors Advanced settings.
If you want to remove the background image, which is where the blue blobs are set you would need this CSS:
@media(max-width: 768px) {
.elementor-element.no-mobile-bg-image {
background-image: none !important;
}
}
And like above you would need to add no-mobile-bg-image
to the Elementor sections CSS class field.