Yup,
just copy the original Moi.css (and maybe Moi.ini if you wan that too) from the (appdata/moi/ui directory back to the (appddata)Moi directory, i.e. one level up from the ui directory.
(The original Moi directory is the "Moi - Copy" directory that the installer created and backed up all your original moi stuff into)
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