Okay, I’ve been reading about Bulma, and it looks nice (on first inspection), and just seems less cluttered than Bootstrap or Foundation somehow.

And then the installation gives options for SASS (all Bulma produces is a single CSS file, which my little brain is very happy with):

Gavins-iMac:~ gavin$ gem install sass
Fetching: rb-fsevent-0.10.3.gem (100%)
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.3.0 directory.

Obviously I don’t want to go big guns and install as SUDO, so then I noticed the equivalent command on Homebrew

brew install sass/sass/sass

There’s a reason I remember this a bit like a bird remembers not to eat stripy caterpillars… Anyway, I then installed Homebrew

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

(So far so good)

And then the weird bit is the version of Dart SASS I seem to have

Gavins-iMac:~ gavin$ sass --version
1.14.2

Although this is (apparently) the very latest version

(Also useful is how to access iCloud Drive via terminal).