Group styles

I’m trying to create styles but I don’t find how group them. For example I want customize background-color and color for .menu class. I create a group and two controls, one for background-color and other for color. The output write the class .menu twice. Is i possible group the styles in one class?

Right now the output looks like this:

.class { background-color: #000; }
.class { color: #FFF; }

I want this:

.class { background-color: #000; color: #FFF; }

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