Make settings modal more mobile friendly

[david-dasilva]

The settings modal is not very mobile friendly at the moment : the input are small and the user has to zoom on it.

Someone more CSS inclined could probably do a better job at making the settings more convenient to use with fingers.

Please keep it lean though : no need for extra dependencies for that.

[Ujjwal-Singh-20]

@david-dasilva Is this acceptable?

Previously it was like this

if it is acceptable, please assign this issue to me under hacktoberfest labels, so i can raise a PR