Different background colors for different widgets

I used the code below (found elsewhere in this forum) to give sidebar widgets on my Catch Everest pro website a subtle background color: #secondary .widget { background-color: #f5f5f5; border: 1px solid #780d08; padding: 20px; padding: 2rem; } However, I would like to make one widget a different background while keeping the rest as is. The widget in question is blog_subscription-7 and I only want to change the background-color to: #f9fdc3. The website is http://carmenamato.net. Thank you very much.