# How do you set alternating colors in the list of topics

**URL:** <https://meta.discourse.org/t/how-do-you-set-alternating-colors-in-the-list-of-topics/46768>\
**Category:** Development\
**Created:** [3 يوليو 2016، 10:52ص UTC](https://meta.discourse.org/t/how-do-you-set-alternating-colors-in-the-list-of-topics/46768 "2016-07-03T10:52:26Z")\
**Posts on this page:** 1\
**Showing post:** 6

<div class="post-metadata">

**Author:** ![fefrei](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/fefrei/32/119538_2.png) [@fefrei](https://meta.discourse.org/u/fefrei)\
**Post date:** [22 مارس 2018، 8:44ص UTC](https://meta.discourse.org/t/how-do-you-set-alternating-colors-in-the-list-of-topics/46768/6 "2018-03-22T08:44:50Z")

</div>

> [@erlend\_sh](#):
>
> Care to extract this into a super simple theme component? 😊

Sure!  
Can you tell me why I cannot use `$primary-low` in the theme component? It’s used all over the place in core (e.g. as the background color of buttons), and I think it’s a good color for the darkened rows, but it’s undefined:

```plaintext
Error: Undefined variable: "$primary-low".
        on line 2 of theme_field.scss
>> background-color: $primary-low;
   ----------------------^

```

---

_[View the full topic](https://meta.discourse.org/t/how-do-you-set-alternating-colors-in-the-list-of-topics/46768)._