Cannot render GraphiQL panel correctly

[CYBAI]

The GraphiQL panels are not rendered correctly.

Url: https://jwerle.github.io/three.graphql/

On Firefox:

On Servo:

With following console logs for Servo

→ ./mach run https://jwerle.github.io/three.graphql/
Download the React DevTools for a better development experience: https://fb.me/react-devtools
[2019-02-13T12:17:45Z ERROR script::dom::bindings::error] Error at https://jwerle.github.io/three.graphql/build.js:16243:14 range(...).getBoundingClientRect is not a function
THREE.WebGLRenderer
79
THREE.WebGLRenderer: WEBGL_depth_texture extension not supported.

Build on macOS 10.14.3 with latest master (c80c3f3)

[CYBAI]

I can reproduce this when unchecking the height: 100vh on Firefox.

cc @emilio