---
sourceDocument: Yokohama ServiceNow AI Platform user interface
sourceDocumentLink: https://servicenow-prod.fluidtopics.net/r/yokohama/platform-user-interface

 Release :

    - yokohama

ft:locale :

    - en-US

ft:publication_title :

    - Yokohama ServiceNow AI Platform user interface

ft:clusterId :

    - platux

bundleId :

    - platux

workflow :

    - Platform


---

# Activating CSS theme support

# Activating CSS theme support {#ariaid-title1}

Release version: Yokohama  
Updated January 30, 2025  
![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read  
There are different plugins that activate CSS themes support.
Activate the following plugins to use themes, based on the version of the UI you use.

Core UI: CSS Theme support See [Activate a plugin](https://www.servicenow.com/docs/access?context=t_ActivateAPlugin&version=yokohama&pubname=yokohama-platform-administration&ft:locale=en-US).
**Related tasks**   

* [Create or customize a theme](https://servicenow-prod.fluidtopics.net/eH4P1zk_~DHPvWcsSP4oXQ "You can create themes or customize existing themes.")  
**Related reference**   

* [Default CSS styles](https://servicenow-prod.fluidtopics.net/J3N4duHyH0Sh_r9Wmn2NzA "You can use CSS styles to control the appearance of elements in a theme.")