Adding background color to element within php if-statement

I have the following code in which I want to add an element to my if statement, but I am unsure how to approach this. What I am looking to do is add a background-color to the else part of it. Within this:

else {
        $status_img = '<img src="../icons/collection/checkmark.png" alt="Goal Complete">';
}

So if $status is not 0, I want to set background color for the class goal-box-right.

Is there anyway I can manipulate the CSS through php like this?

foreach ($rows as $row) {
            $status = $row['status'];
            if ($status == 0) {
                $status_img = '<img src="../icons/collection/x-sign.png" alt="Goal Not Complete">';
            }
            else {
                $status_img = '<img src="../icons/collection/checkmark.png" alt="Goal Complete">';
            }
            $goal_date = $row['date'];
            $fixed_goal_date = fixDate($goal_date);
            $html = "";
            $html .= '<div class="goal-box" id="comment-'.$row['id'].'">';
            $html .= '<div class="goal-box-left">'; //added
            $html .= '<div class="goal-post-status">'.$status_img. '</div>';
            $html .= '</div>'; //added
            $html .= '<div class="goal-box-right">'; //added
            $html .= '<div class="goal-post-title">'.$row['title']. '</div>';
            $html .= '<div class="goal-post-date">'.$fixed_goal_date. '</div>';
            $html .= '<div class="goal-post-description">'.$row['description']. '</div>';
            $html .= '</div>'; //added
            $html .= '</div>';