There’s always some sort of source code. Usually you can right click any site element and “inspect” it or whatever your browser calls it. Try it, and then come back here with some specific question or some example code for us to comment on.
Never mind, i didn’t know i could take all the script.
Now i have another specific question. Instead of using the shinydemos.com look, i decided it was too fancy for a general website i want to make. Instead i used a demo and downloaded the files from a css-tricks example. Can i use the files in my own website? Or am i going to jail?
I wouldn’t say you’re going to jail for using them. But I definitely think you should try to create something by yourself. Don’t just copy and paste code. Look at the examples, tweak the code a bit and try to understand it line by line.