Hello

Thank you for your query. Could you provide your site URL please?

Also, could you please check the screenshot, it is not opening from my end.

You can use this for sharing your screenshot here https://imgur.com/upload

website not availble for you to see. this is screenshoot https://www.screencast.com/t/LA6TCAzM

https://imgur.com/5LnXH60

Please see the CSS below.

Use this in Custom CSS section. Replace "#ff2c2c" with the colour you prefer. or use "unset" if you do not want any background colour.

.article-full-image {
    background-color: #ff2c2c;
}

To find Custom CSS, you can go to Extensions -> Templates -> Styles, then click on Template options and then go to Custom code to add this code.

this will remove background colour. but i need to remove that overlay (red colour)

Thank you so much

You are most welcome.

Have a great day and stay safe.