In addition to color, numbers, strings, booleans, and null, Sass also has two other data types, lists and maps.

  • Lists can be separated by either spaces or commas. For example, the following list denotes font properties, such as:
1.5em Helvetica bold;


Helvetica, Arial, sans-serif;

Note: You can also surround a list with parentheses and create lists made up of lists.

  • Maps are very similar to lists, but instead each object is a key-value pair. The typical map looks like:
(key1: value1, key2: value2);

Note: In a map, the value of a key can be a list or another map.



At the top of main.scss, create a new list variable:

$standard-border: 4px solid black;

Find all of the instances that use 4px solid black in main.scss and replace them with the $standard-border variable reference. You’ve been using a list and you didn’t even know it!

Click “Run” to see your changes in the browser and inspect output in main.css.

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