Widget area background color

I want to change the widget background color. I am using a child theme and am using firebug. I am trying to change it to white to match the site background.

This is the main theme’s css:

.widget {
      background-color: rgba(247, 245, 231, 0.7);
}

I’ve tried changing it to

widget {
      background-color: #fff;
}

but with no success. I’ve also tried it in rgb and rgba. Could something else in the main theme be overriding my changes or am I trying to change the wrong thing?

I don’t have a cache plugin to turn off.
http://ornamentdesigns.com