CSS "quot; symbol

Question

Im looking for gradient tutorial in google and i see something like this:
$green = #10f210
$blue = #0025fd

.mainBG {
color: linear-gradient(green, blue);

i don't know what does this symbol mean "

Answer 1

Css doesn't use $ to define variables, but SCSS uses $ to define variables.
SCSS need to be compiler to CSS before it could work together with HTML.

Answer 2

We don’t use $ for CSS.