Changing content background color on only one page

[FoxdenVixen]

I am trying to get rid of a background color of the content area that I set for the entire site I am working on only for the forums section. I created a page for the forum index. The shortcode is http://mydomain.com/?p=547. This is what I have for code that created the background on all pages

div#primary {
  background: rgba(202, 225, 233, 0.8);
  -webkit-border-radius: 50px;
  -webkit-border-bottom-left-radius: 0;
  -moz-border-radius: 50px;
  -moz-border-radius-bottomleft: 0;
  border-radius: 50px;
  border-bottom-left-radius: 0;
  color: #000;
  font-weight: 600;
  font-size: 16px;
}

Using the above info I tried to add this code

div#primary.page-id-547{
background: none !important;  
}

However, it is not working. Any suggestions for removing the content background of the forums so that I can style it differently than the rest of the site?

[Alyssa]

@foxdenvixen try this instead:

.page-id-547 div#primary{
background: none !important;  
}

[FoxdenVixen]

Thank you, @tjchester. I will give this a try.