Change Link Color

Hello, I’m building a WP theme and am making a home page. If you visit http://beta.techyoucation.com/ you will see box in the top left with a purple top. The content in that is the latest post, which I got using

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
      <?php
    // Fetch most recent posts, limit to 1
		$latest_posts = get_posts( array(
			'posts_per_page' => 1,
		) );
    // get first and only item in array
		$latest_post  = $latest_posts[0];
	?>

	<h3><a href="<?php echo get_permalink( $latest_post->ID ); ?>"><?php echo $latest_post->post_title; ?></a></h3>
	<?php if ( has_excerpt( $latest_post ) ) : ?>
	<p><?php echo $latest_post->post_excerpt; ?></p>
	<?php else : ?>
	<?php echo strip_shortcodes(wp_trim_words( $latest_post->post_content, 50 )); // '250' is number of words ?>

	<?php endif; ?>

Now the title “Coming Soon” is green like every other link on the site, but I would like this one to be purple like the box?

How would I do this

Thanks in advance

Aled