Learn SASS to create dynamic, reusable styles and efficiently manage and migrate CSS projects.

Web Page Styling—CSS

SASS (Syntactically Awesome Style Sheets) is a scripting language known as a CSS preprocessor. CSS preprocessors are compiled into CSS and, by doing so, extend the default capabilities of CSS. SASS makes authoring stylesheets faster, easier, and more flexible. It’s a welcome helper in the world of web design because anyone who’s created a website knows that CSS is hard. In this module, we’ll learn how to use nesting, variables, mixins, partials, functions, and more to write dynamic and reusable styles of code. We’ll also learn the various methods to structure our projects and bring organization to our stylesheets. By the end of this module, we’ll have advanced knowledge of SASS. We’ll be able to migrate an existing CSS codebase, as well as set up an entire project (and build process) from scratch.

Sass for CSS: Advanced Front-End Development

When you observe the structure of an HTML file, you’ll notice it has a very clear hierarchy:

```HTML
<!DOCTYPE html>
<html>
  <head>
    <title>Page Title</title>
  </head>
<body>

<h1>My First Heading</h1>
<p>My first paragraph.</p>

</body>
</html>
```
As you can see, HTML has a structure that makes it quite easy to read.

CSS, on the other hand, lacks this visual structure. Which is why it has a tendency to become disorganized quite quickly. Enter Sass **nesting**! 

## Definition
Using nesting, we can nest child selectors inside of the parent selector.

This results in much cleaner and less repetitive code.

## Example
Take the following HTML:
```HTML
<nav class="navbar">
  <ul>
    <li>Home</li>
    <li>Store</li>
    <li>Contact Us</li>
  </ul>
</nav>
```

Using regular CSS, we would write this like so:


When you observe the structure of an HTML file, you’ll notice it has a very clear hierarchy:

```HTML
<!DOCTYPE html>
<html>
  <head>
    <title>Page Title</title>
  </head>
<body>

<h1>My First Heading</h1>
<p>My first paragraph.</p>

</body>
</html>
```
As you can see, HTML has a structure that makes it quite easy to read.

CSS, on the other hand, lacks this visual structure. Which is why it has a tendency to become disorganized quite quickly. Enter Sass **nesting**! 

# Definition
Using nesting, we can nest child selectors inside of the parent selector.

This results in much cleaner and less repetitive code.

# Example
Take the following HTML:
```HTML
<nav class="navbar">
  <ul>
    <li>Home</li>
    <li>Store</li>
    <li>Contact Us</li>
  </ul>
</nav>
```

Using regular CSS, we would write this like so:


When you observe the structure of an HTML file, you’ll notice it has a very clear hierarchy:

```HTML
<!DOCTYPE html>
<html>
  <head>
    <title>Page Title</title>
  </head>
<body>

<h1>My First Heading</h1>
<p>My first paragraph.</p>

</body>
</html>
```
As you can see, HTML has a structure that makes it quite easy to read.

CSS, on the other hand, lacks this visual structure. Which is why it has a tendency to become disorganized quite quickly. Enter Sass **nesting**! 

# Definition
Using nesting, we can nest child selectors inside of the parent selector.

This results in much cleaner and less repetitive code.

# Example
Take the following HTML:
```HTML
<nav>
  <ul>
    <li>Home</li>
    <li>Store</li>
    <li>Contact Us</li>
  </ul>
</nav>
```

Using regular CSS, we would write this like so:


In this lesson, we'll be introducing the SASS nesting syntax.

Starting with SASS

SASS Features

Structuring your SASS Projects

Setting up a SASS Build Process

Bonus: Setting up Media Queries with SASS Mixins

Appendix

Conclusion

Nesting