CSS theme support

---
title: CSS theme support
description: Themes give the user interface a specific look and feel by using different color combinations.
locale: en-US
canonical_url: https://www.servicenow.com/docs/r/platform-user-interface/c\_CSSThemeSupport.html
release: brazil
topic_type: concept
last_updated: "2026-09-10"
reading_time_minutes: 1
breadcrumb: [Customizing instance appearance, User interface configuration, Working in Core UI, Configure UIs and portals, Configure user experiences]
---

# CSS theme support

Themes give the user interface a specific look and feel by using different color combinations.

System administrators can create themes or customize the existing themes for an instance. To see existing themes, navigate to **System UI** > **Themes**.

-   **[Activating CSS theme support](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/brazil/markdown/platform-user-interface/r_ActivatingCSSThemeSupport.md)**  
There are different plugins that activate CSS themes support.
-   **[Create or customize a theme](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/brazil/markdown/platform-user-interface/t_CreateOrCustomizeATheme.md)**  
You can create themes or customize existing themes.
-   **[Default CSS styles](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/brazil/markdown/platform-user-interface/r_DefaultCSSStyle.md)**  
You can use CSS styles to control the appearance of elements in a theme.

**Parent Topic:**[Customizing instance appearance](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/brazil/markdown/platform-user-interface/customizing-instance-appearance.md)