Learn SCSS (Sass) Part 2

Andrew Richards
2 min readOct 9, 2020

In part 1 I highlighted some of the basic features of Sass. Check out the first part here:

In this article I will go over the remaining features that make Sass great. Those are Extend/Inheritance & Operators.


Sass has a few ways of making it so we don’t have to repeat ourselves with our code. One of the ways of doing this is to create a placeholder that can be extended.

You can use the “%” symbol to create a class that you only want to extend.

Extending means giving a css class the attributes of the extended class. This way we don’t have to write the same code over and over.

Here is a code snippet from the docs:

/* This CSS will print because %message-shared is extended. */
border: 1px solid #ccc
padding: 10px
color: #333

// This CSS won't print because %equal-heights is never extended.
display: flex
flex-wrap: wrap

@extend %message-shared

@extend %message-shared
border-color: green

@extend %message-shared
border-color: red

@extend %message-shared
border-color: yellow

To extend, as it is shown, all you have to do is use “@extend” with the “%” symbol and class name. This will ensure that the success, error, and warning class all have the attributes from the “message-shared” class.


Prior to Sass, you couldn’t perform any math in a CSS file. Operators in Sass change this by giving you the ability to do math with your attributes.

.container {
width: 100%;

article[role="main"] {
float: left;
width: 600px / 960px * 100%;

aside[role="complementary"] {
float: right;
width: 300px / 960px * 100%;

This is a great feature and saves you from writing Javascript to take care of things like this.


And that’s really it. Stay out of trouble my friends.