Add a class to MY_requestquotewidget

I am working with a template that includes this widget. It is, by default, set to contain three of these request a quote widgets and I have made adjustments to fit four of them . Only problem is I can’t figure out where to change the class so that I can set four separate background images.

Site is HERE

The class .second is applied to the second widget but I need to figure out where it is applying it in the HTML so that I can apply a .third and .fourth to those widgets as well. I’ve looked at the PHP for the widget but I don’t think it’s calling it there.

<?php
// =============================== My Request Quote Widget ======================================
class MY_RequestQuoteWidget extends WP_Widget {
    /** constructor */
    function MY_RequestQuoteWidget() {
        parent::WP_Widget(false, $name = 'My - Request a Quote');
    }

    /** @see WP_Widget::widget */
    function widget($args, $instance) {
        extract( $args );
        $title1 = apply_filters('widget_title1', $instance['title1']);
	   $title2 = apply_filters('widget_title2', $instance['title2']);
	   $title3 = apply_filters('widget_title3', $instance['title3']);
				$txt1 = apply_filters('widget_txt1', $instance['txt1']);
				$txt2 = apply_filters('widget_txt2', $instance['txt2']);
				$txt3 = apply_filters('widget_txt3', $instance['txt3']);
        ?>

		<?php
			if($txt2=="" && $txt3==""){
				$class='w-full';
			} else {}
		?>
              <?php echo $before_widget; ?>
			  			<div class="top-box">
							<?php if($title1!=""){ ?>
							<div class="box-text <?php echo $class; ?>">
								<div class="title">
									<h2><?php echo $title1; ?></h2>
									<h2 class="middle"><?php echo $title2; ?></h2>
									<h2><?php echo $title3; ?></h2>
								</div>
								<p><?php echo $txt1; ?></p>
							</div><!-- end 'with title' -->
							<?php } else { ?>
							<div class="box-text <?php echo $class; ?>">
								<p><?php echo $txt1; ?></p>
							</div><!-- end 'without title' -->
							<?php } ?>

							<?php if($txt2!="" && $txt3!=""){ ?>
								<div class="box-button">
									<a href="<?php echo $txt3; ?>" class="button"><span class="right"><span class="tail"><?php echo $txt2; ?></span></span></a>
								</div><!-- end 'button' -->
							<?php } ?>
						</div>
              <?php echo $after_widget; ?>
        <?php
    }

    /** @see WP_Widget::update */
    function update($new_instance, $old_instance) {
        return $new_instance;
    }

    /** @see WP_Widget::form */
    function form($instance) {
        $title1 = esc_attr($instance['title1']);
	   $title2 = esc_attr($instance['title2']);
	   $title3 = esc_attr($instance['title3']);
				$txt1 = esc_attr($instance['txt1']);
				$txt2 = esc_attr($instance['txt2']);
				$txt3 = esc_attr($instance['txt3']);
        ?>
       <p><label for="<?php echo $this->get_field_id('title1'); ?>"><?php _e('Title row #1:', 'theme1343'); ?> <input class="widefat" id="<?php echo $this->get_field_id('title1'); ?>" name="<?php echo $this->get_field_name('title1'); ?>" type="text" value="<?php echo $title1; ?>" /></label></p>
	   <p><label for="<?php echo $this->get_field_id('title2'); ?>"><?php _e('Title row #2:', 'theme1343'); ?> <input class="widefat" id="<?php echo $this->get_field_id('title2'); ?>" name="<?php echo $this->get_field_name('title2'); ?>" type="text" value="<?php echo $title2; ?>" /></label></p>
	    <p><label for="<?php echo $this->get_field_id('title3'); ?>"><?php _e('Title row #3:', 'theme1343'); ?> <input class="widefat" id="<?php echo $this->get_field_id('title3'); ?>" name="<?php echo $this->get_field_name('title3'); ?>" type="text" value="<?php echo $title3; ?>" /></label></p>
			 <p><label for="<?php echo $this->get_field_id('txt1'); ?>"><?php _e('Text:', 'theme1343'); ?><textarea rows="5"  class="widefat" id="<?php echo $this->get_field_id('txt1'); ?>" name="<?php echo $this->get_field_name('txt1'); ?>"><?php echo $txt1; ?></textarea></label></p>
			 <p><label for="<?php echo $this->get_field_id('txt2'); ?>"><?php _e('Button Text:', 'theme1343'); ?> <input class="widefat" id="<?php echo $this->get_field_id('txt2'); ?>" name="<?php echo $this->get_field_name('txt2'); ?>" type="text" value="<?php echo $txt2; ?>" /></label></p>
			 <p><label for="<?php echo $this->get_field_id('txt3'); ?>"><?php _e('Button URL:', 'theme1343'); ?> <input class="widefat" id="<?php echo $this->get_field_id('txt3'); ?>" name="<?php echo $this->get_field_name('txt3'); ?>" type="text" value="<?php echo $txt3; ?>" /></label></p>
        <?php
    }

} // class Request Quote Widget

?>

And the styles are as follows:

/* Request a quote */
#request {
	width:100%;
	background:url(images/pattern.gif) center;
}
.widget_my_requestquotewidget {
	width:185px;
	float:left;
	margin:-70px 0 0 29px;
	position:relative;
	}
.widget_my_requestquotewidget:first-child {
	margin-left:0px;
}
	.widget_my_requestquotewidget .title {
		width:185px;
		height:186px;
		background:url(images/request-title-bg01.png) no-repeat left top;
		text-align:center;
		margin-bottom:23px;
	}
	.widget_my_requestquotewidget.second .title {
		background:url(images/request-title-bg02.png) no-repeat left top;
	}
	.widget_my_requestquotewidget.third .title {
		background:url(images/request-title-bg03.png) no-repeat left top;
	}
	.widget_my_requestquotewidget.fourth .title {
		background:url(images/request-title-bg04.png) no-repeat left top;
	}

		.widget_my_requestquotewidget .title h2 {
			font-size:180%;
			line-height:200%;
			color:#564b44;
			font-family: 'Playfair Display', serif;
			margin:0;
			letter-spacing:-3px;
		}
		.widget_my_requestquotewidget.second .title h2 {
			color:white;
		}
		.widget_my_requestquotewidget .title h2:first-child {
			padding-top:25px;
		}
		.widget_my_requestquotewidget .title h2.middle {
			color:white;
			font-size:290%;
			line-height:100%;
			margin:-7px 0 -6px 0;
		}

	.top-box {
		overflow:hidden;
		zoom:1;
		position:relative;
		}
	.box-button {
		text-align:center;
		}
	.box-text p {
		color:#ccbeb6;
		font-size:.9em;
		line-height:1.2em;
		text-transform:uppercase;
		text-align:center;
		margin-bottom:30px;
		}

You can see where I’ve added the third and fourth styles but then how do I actually tell it to call those and apply them to those widgets?

Any ideas?