Large image width overridden by theme

The theme I’m using sets the max-width for img’s in a post to be 97.5%, which shrinks the background image in the large card a bit and leaves a blank area at the right.

I fixed this by setting the max-width value in css file as below:

.large.wp-pic .wp-pic-asset-bg img{
	padding: 0;
	margin: 0;
	display: block;
	max-width: 100%;
}

https://www.ads-software.com/plugins/wp-plugin-info-card/