The site didn't load for me, but I found their YouTube[1] channel to have a gander. They remind me a lot of the microcars[2] of the 40s and 50s, the most famous of which would be BMW's Isetta[3]. In terms of style, however, I the Elio reminds me a bit of the Messerschmitt KR200[4].

[1] https://www.youtube.com/user/eliomotors

[2] https://en.wikipedia.org/wiki/Microcar

[3] https://en.wikipedia.org/wiki/Isetta

[4] https://en.wikipedia.org/wiki/Messerschmitt_KR200