/usr/lib/ghc-doc/hoogle/libghc-css-text-doc.txt is in libghc-css-text-doc 0.1.2.2-3build6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-css-text-doc/html/css-text.txt