Grey Overlay on Image Card Images (not added)

Site URL: https://www.covid-19connect.com/thankyou

Hey all, hoping for some help. When I upload vector images (saved as JPG) with white backgrounds, some come up with a grey-looking overlay. Any ideas on how to remove the overlay? Here's a link - the first image comes up with a clean white background, and the second two do not. How do I fix this? https://www.covid-19connect.com/thankyou

Did this get fixed?  I went to your page and saw no grey.  Did you alter the image in the editor?

Add to Home > design > Custom CSS

.image-overlay {
    background: transparent !important;
}

Thanks Tuanphan.  Was searching for this too. Worked perfectly after adding section ID. The grey overlay is still visible as I work on site but not when on full screen nor on mobile mode. 

8 hours ago, GRV said:

Thanks Tuanphan.  Was searching for this too. Worked perfectly after adding section ID. The grey overlay is still visible as I work on site but not when on full screen nor on mobile mode. 

so did you solve or still need help? You can share link to page where you use image card. We can check easier.