Resizing of content only happens when the height changes?

[houseofdreams]

Hi. I've made my own website, following this tutorial on YT, but when I now visit this "room" on my iOS device (iPhone) it only shows the entire scene, when rotated in landscape mode. In portrait mode, the sides are cut off.

When I view it on a desktop pc, and I resize the window height, it scales like you expect, but when you resize it horizontally, the content doesn't scale.

Is there a code to make this scaling also happen horizontally?

Thanks!