Do you have a URL to the page you’re trying to edit? It looks like you’ll just need to set the CSS of that div to background-color: transparent; or opacity: 0; but without seeing the actual page, it’s hard to say for sure what the correct code would be.
@aoking the query is generic any post on wordpress. Could you provide the excerpt of the CSS? Does that mean that I will have to apply the excerpt to all posts individually?
Try adding this to your CSS:
.content-area section {
background-color: transparent !important;
}
It should force the main content area of interior pages to a transparent background.