Both Inter-UI and Montserrat use the SIL license, and Inter-UI has an additional personal copyright notice. These must be delivered with the fonts and made available to the consumer of the product.
2) Original or Modified Versions of the Font Software may be bundled,
redistributed and/or sold with any software, provided that each copy
contains the above copyright notice and this license. These can be
included either as stand-alone text files, human-readable headers or
in the appropriate machine-readable metadata fields within text or
binary files as long as those fields can be easily viewed by the user.
Both Inter-UI and Montserrat use the SIL license, and Inter-UI has an additional personal copyright notice. These must be delivered with the fonts and made available to the consumer of the product.
https://github.com/rsms/inter/ https://fonts.google.com/specimen/Montserrat
It may be wise to make a notice of this in https://github.com/ipfs-shipyard/ipfs-css/blob/master/LICENSE