[Theme: Unite] Image frame appearing in one template, not appearing in other

My website uses two templates: one where basic content stretches the whole page, and one where room for a sidebar exists. In the full-page template, images do not have any border surrounding them: https://www.centennial-group.com/?page_id=1855. In the sidebar template, they do: https://www.centennial-group.com/?page_id=1377. The HTML behind the images is identical, and the images are all standard .jpg’s loaded through the WordPress media library, so my guess is that it has something to do with the templates.

In a previous query, someone on here said that this is doing that:

.postcontent img, .widget_sp_image img {
    background: none repeat scroll 0 0 #FFFFFF;
    border: 1px solid #DCDCDC;
    border-radius: 5px;
    padding: 5px;
}

What do I do with this block of code to fix the issue?