I am struggling to make changes in CSS to some images I added to a simple section with background. I added the images using the Add Media button, then attempted to add some class tags in the html text box portion of Edit Page. I am discovering that any changes I make in style.css will work only if I’m using a pre-existing class from the template (i.e., class=”alignleft”. If I assign additional tags in the html text box and apply values to them in style.css, nothing happens. I need to be able to define classes and adjust them so that the images will be responsive. How can I accomplish this?