The site you’re seeing now is a WordPress site.
Each WordPress site has a theme. A theme is kind of design template and this theme is called Business Identity and was created by Professional Themes and is sold here.
This theme is very easy to use and setup. I’ve not done any php to make this site look like this.
I know one of the authors of this theme, Philip Arthur Moore and I trust him very much. He is based in Hanoi and he sometimes comes to Bangkok.
Currently, I’m trying to make the Japanese version of this site more optimized with the theme when it has Japanese fonts.