Change color of a region

Hello,

I was looking here because my problem, but I don't find a solution.

I need to change the background color of a region. On the page I have 3 regions and the first region should be red.

Here is the page:

And it should be like this:

The region-template is this:

<section class="uRegion uNoHeading #REGION_CSS_CLASSES# clearfix" id="#REGION_STATIC_ID#" #REGION_ATTRIBUTES#>
  <div class="uRegionHeading">
    <span class="uButtonContainer">
      #CLOSE##PREVIOUS##NEXT##DELETE##EDIT##CHANGE##CREATE##CREATE2##EXPAND##COPY##HELP#
    </span>
  </div>
  <div class="uRegionContent clearfix">
    #BODY#
  </div>
</section>

Kind regards,

Mark