CSSO npm not working while others are

Question

I’m new to Node.js & npm and am trying to figure out why the uglifyjs module is working while the csso module is not.

i recently moved my global install to following location

/Users/myname/.node_modules_global/bin/npm

via this tutorial’s recommendation.

to show they are both installed globally i do this via the command line

npm list -g --depth=0

and i get this result

/Users/myname/.node_modules_global/lib
    csso@3.1.1
    npm@5.3.0
    uglify-js@3.0.25

for testing purposes i navigate to a local static site and run the commands using the CLI.

the uglifyjs command works. but when running the command for csso which is

$csso style.css style.min.css

i get this error

bash: csso: command not found

i’m at a loss how to even troubleshoot except this.