XF 2.1 Unread Alerts - Where do I change the background colour?

BIG LLC

Member
I cannot seem to find the background colour option for Alerts anywhere.

<li data-alert-id="217173456" class="alert js-alert menu-row menu-row--separated menu-row--clickable is-unread">

It seems to be .alert.is-unread

My blind guess is that it is a generic palette option? Otherwise I have to add a style to extra.less ?
 
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