grammar error on overview page

[JeanMarcZimmer]

On the overview page : https://aramvisser.github.io/bulma-steps/
The first sentence under "Installation" contains an error :

This is an extensions for the Bulma CSS framework.

There is only one extension, which here doesn't take an "S"...
There might be some other errors, but this one appears on the screen at page loading, and it's a really bad feeling...