Background color for container?

I changed the background of my site using the customizer but the container with the content remains white by default.

I am assuming that I should be changed the CSS style within these divs?

Can someone kindly confirm that I am correct?

<div id="page" class="hfeed site grid-container container grid-parent">
		<div id="content" class="site-content">
			
	<div id="primary" class="content-area grid-parent mobile-grid-100 grid-75 tablet-grid-75">
		<main id="main" class="site-main">

    >>> THEN ALL MY CONTENT 

.content {
background-color: #898989;
}

Is that correct?

Thanks!