There are some tools online in the future that can help you anytime you are curious exactly what theme/technology is going on...
https://whatwpthemeisthat.com/
https://www.wpthemedetector.com/
https://builtwith.com/
lastly if the site is WP, you can look @ page source and "CTRL +F" search "wp-theme/" and it will tell you the name right there in the directory structure. really nice sites usually use custom made themes.
https://whatwpthemeisthat.com/
https://www.wpthemedetector.com/
https://builtwith.com/
lastly if the site is WP, you can look @ page source and "CTRL +F" search "wp-theme/" and it will tell you the name right there in the directory structure. really nice sites usually use custom made themes.