Renamed to aDifferentJT/elm-bootstrap. That is where the repository lives now. It has not been published as a package under the new name.
Versions published as nixCodeX/elm-bootstrap still install under that name. 13 versions of 13 come from the new location (see their notes).
Rerouted (renamed, verified). The GitHub user or repository was renamed. The tag is still there, at the new name. The Lamdera package server serves a copy recovered from https://github.com/aDifferentJT/elm-bootstrap.
What we checked: The repo moved to github.com/aDifferentJT/elm-bootstrap. Rebuilt with git archive from commit 77a30ed727b0 of https://github.com/aDifferentJT/elm-bootstrap (zip prefix nixCodeX-elm-bootstrap-77a30ed/, America/Los_Angeles times): the zip is byte-identical to the one package.elm-lang.org recorded, SHA-1 d4637469f6c86d5f9055b35cec2e56a92970c868.
The Lamdera compiler uses this copy and prints a one-line notice saying so. elm itself fails to download this version.
Details · package.elm-lang.org's zip: https://github.com/nixCodeX/elm-bootstrap/zipball/2.0.1/
Easily make an element as wide or as tall (relative to its parent) with our width and height utilities.
Set height to 50% of parent element.
Set height to 75% of parent element.
Set height to 100% of parent element.
Set width to 25% of parent element.
Set width to 50% of parent element.
Set width to 75% of parent element.
Set width to 100% of parent element.
Set height to 25% of parent element.