How can i put style.css with my index.html
Repl.it already does this for you. Under your
<head> tag, do you see where it does this? It's on the line that says:
<link href="style.css" rel="stylesheet" type="text/css" />
Essentially, this tells the webpage that there is an external reference with the name "style.css", which is a stylesheet in the CSS format.