Responsive Space Tourism with JavaScript

This project initially looks easy but really challenging to make this responsive. Even the JavaScript part implemented in few minutes but the styling and responsiveness part takes me couple of days to finish. Still I left to do some styling properties but hope to make it better in the future. I have a question that which is the best way to implement this website efficiently , do i need to create html pages for all different pages or creating one html page and integrating other pages into this using js ? I am a newbie and your suggestions will be helpful for me.