This website was redesigned (from the original) using the free Twenty Seventeen WordPress community theme with heavy CSS and HTML modifications. There are also many plugins and widgets installed for a more secure and interactive blog-style website. The plugins range from anti-spamming, secure logins, and other security-related features, to Google Analytics boosters, Twitter/Facebook/Pinterest plugins, and secure web form builders designed for WordPress.
I often try other color schemes just for the experience of doing so. Since this theme was implemented there have been several, but the screenshots above show the latest design as of this post.