Last year (and this year), I played around with applying different themes to my site. There are so many to choose from, It can be daunting to find just the right one.
I thought this year I would try to manually determine the theme another site uses. That was pretty fun.
I went to https://www.wpbeginner.com/wp-themes/how-to-find-which-wordpress-theme-a-site-is-using/ and tried the IsitWP tool. It found that the website was a WordPress site, but that the Theme was a custom one not in the WP list of themes.
So I went through the manual process (explained in the page above) and it led me to a website with themes that could be purchased. The theme was called Kalium and is $60 to purchase.