Image comes with a Border!

Please provide a link to your site so someone can try and help you without having to install the theme

https://demon.thecomputerstore.biz/?page_id=4

If you don’t already have a child theme or a custom.css you should install a plugin like custom CSS plugin then add the following to the custom css area.

.site-content .entry-content p a img, .site-content .entry-content p img {
box-shadow: none;
}

Add to the custom css in theme options.

.site-content .entry-content p a img, .site-content .entry-content p img {
box-shadow: none;
}

Problem Solved!
thank you salsaturation & Fruitful Code both.