Universal
Omnipresent, Ubiquitous
な adjective
Remember how 普遍 means "universal?" Well when you add like it's still universal! Easy!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
とても普遍的なテーマだと思います。
I think it’s a really universal theme.