Units interface

[erwanp]

Hello! Great to be able to use units.

@arunavabasu-03 I think the layout for small devices (phones) can be improved

Pressure and path length units should remain on the same line. We show cm-1 twice. Let's add the unit choice next to the " wavenumber range" text.

[erwanp]

@arunavabasu-03 do you think it's doable ?

[arunavabasucom]

I will do that @erwanp !! 😀