Setting up our project
You're probably eager to start writing some Sass, so let's jump right in. I'm going to create my project in my root (C:/) directory, but you can place your project wherever is easiest for you. I'll call it mastering-sass and inside I'll create the following files and folders in that folder: sass and index.html and within the sass folder create a file: style.scss.
Open your index.html file in your editor of choice and add the following markup:
<!-- mastering-sass/index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Mastering Sass: Chapter 2</title>
<link href="css/style.css" rel="stylesheet">
</head>
<body>
<div>
<h1>Heading 1</h1>
<h2>Heading 2</h2>
<h3>Heading 3</h3>
<h4>Heading 4</h4>
<h5...
