catalog java script and css cheat file

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Hello community. 

i come to you because i started using Catalog and im having some issues in applying changes in java script and css, im not a web developer so im a basic user and my question is: 

where i cand find a cheat java script and css so i can have and idea of how to make some changes.

I am the pedagogical engineer of my institution and i have the mission of adjusting the regular listings for example change the self-paced text for other text.

i hope some one can help.