issueNumber: MDL-83725 notes: theme_boost: - message: >- From now on, themes can customise the activity icon colours using simple CSS variables. The new variables are $activity-icon-administration-bg, $activity-icon-assessment-bg, $activity-icon-collaboration-bg, $activity-icon-communication-bg, $activity-icon-content-bg, $activity-icon-interactivecontent-bg. All previous `$activity-icon-*-filter` elements can be removed, as they are no longer in use. type: changed