Cascading Style Sheets (CSS) is a document type and the associated scripting language that describes the presentation of HTML documents. Using the CSS language, you can control the look and feel of web pages by defining layout, text, and image properties to be applied in a wide array of contexts.

This course is a comprehensive introduction to both writing and implementing CSS. Using the document hierarchy model, you’ll learn how to tailor web styles to specific areas. With your hierarchy defined, you’ll dive deep into CSS fundamentals, adding colors, text styles, and backgrounds to your web page. After you’ve defined these elements, you’ll use CSS to define layouts around pictures and text flow and completely control your web page’s look. You’ll wrap up by exploring the essential animation functions of CSS.

By the end of this course, you’ll have functional mastery of Cascading Style Sheets and the CSS scripting language. You’ll be prepared to build professional web pages with your code.

Luka

Highly recommended! Tim covers everything & gets right to the important stuff!

Frontend dev

The Complete Beginner’s Guide to CSS

# HSL colors
**Hue Saturation Lightness (HSL) colors** are a more recent addition to CSS.

Similarly to RGB, we also list three values. The first is the hue (a value from `0` to `360`), then our saturation (a percentage from `0%` to `100%`), and then our lightness (a percentage from `0%` to `100%`). Examples are provided in the code snippet below:

```css
color: hsl(0, 0%, 0%);       /* black */
color: hsl(0, 0%, 100%);     /* white */
color: hsl(0, 100%, 50%);    /* red */
color: hsl(120, 100%, 25%);  /* green */
color: hsl(240, 100%, 50%);  /* blue */
color: hsl(60, 100%, 50%);   /* yellow */
```

HSL colors are opaque by default. To add opacity, use the `hsla()` functional notation to add a fourth value ranging from `0` (completely transparent) to `1` (completely opaque).

```css
color: hsla(180, 100%, 50%, .5);
```
# Example 

Introduction to CSS

CSS Selectors

CSS Core Concepts

CSS Units

CSS Fundamentals

Backgrounds & Colors

CSS Layout

Animating Your CSS

CSS Architecture

Conclusion

HSL/HSLA

HSL colors

Example