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Themes and Styles for an ASP.NET Core Application

  • 6 minutes to read

Supported Themes

Web Dashboard themes are based on Generic and Generic Compact DevExtreme themes. You can apply a predefined theme from the list below or customize a theme to your specifications.

Each theme consists of stylesheets that contain a collection of CSS classes:

Image Theme CSS File (Generic) CSS File (Generic Compact)
Light Theme Light dx.light.css
Dark Theme Dark dx.dark.css
Carmine Theme Carmine dx.carmine.css
Soft Blue Theme Soft Blue dx.softblue.css
Green Mist Theme Green Mist dx.greenmist.css
Dark Moon Theme Dark Moon dx.darkmoon.css
Dark Violet Theme Dark Violet dx.darkviolet.css


A compact theme allows you to fit more elements within a web page. Note that compact themes affect only the following items:

The look of Light and Dark themes varies depending on the Dashboard version:

  • v19.1 and earlier: Light and Dark themes add custom colors to the corresponding DevExtreme themes and their compact counterparts. For example, the custom selection color was blue.
  • v19.2 and later: Light and Dark themes use only the colors listed in the corresponding DevExtreme themes. To revert to the appearance available in previous versions, apply Light Blue and Dark Blue themes instead (or their compact counterparts):

    Image Theme CSS File (Generic) CSS File (Generic Compact)
    Light blue custom theme Light Blue dx.light-blue.css
    Dark blue custom theme Dark Blue dx.dark-blue.css

Apply a Built-in Theme

To apply one of the predefined themes, use the corresponding CSS files when you bundle resources. The code snippet below shows how to apply the Carmine theme:

    "outputFileName": "wwwroot/css/site.min.css",
    "inputFiles": [
    "minify": { "enabled": false, "adjustRelativePaths": false }

Customize Themes

Use the DevExpress Dashboard CLI to create a custom Dashboard theme based on a DevExtreme theme created with the ThemeBuilder.

The DevExpress Dashboard CLI is a command line tool based on Node.js. It is used with the DevExtreme ThemeBuilder to create a custom theme for the Web Dashboard.


Refer to the ThemeBuilder article for more information about the DevExtreme ThemeBuilder tool.

Create a Custom Theme

  1. Make sure you have Node.js and npm installed on your machine.
  2. Open the ThemeBuilder. Create a custom theme based on Generic themes. For instance, you can use the Light theme as a base and change its accent color from blue (#337ab7) to yellow (#fdb400).
  3. Set the color scheme name (for example, “light-yellow”) and use the Export MetadataDownload Metadata File button to export metadata in a JSON format.
  4. Copy the downloaded JSON file (dx.generic.light-yellow.json) to an empty folder.
  5. Edit dx.generic.light-yellow.json and add the dashboardItems property to override the accent colors at the dashboard level:

        "items": [
                "key": "@base-accent",
                "value": "#fdb400"
        "dashboardItems": [  
                "key": "@dashboard-item-selected-bg", 
                "value": "rgba(#fdb400, 0.2)" 
                "key": "@dashboard-item-hover-bg", 
                "value": "rgba(#fdb400, 0.1)" 
        "baseTheme": "generic.light",
        "outputColorScheme": "light-yellow",
        "makeSwatch": false,
        "version": "22.1.4",
        "widgets": [],
        "removeExternalResources": false

    Refer to the Color Constants section to see a list of available color constants you can use to customize Web Dashboard colors.

  6. In the folder you created in Step 4, execute the command that installs the devexpress-dashboard-cli package and builds the CSS files for your custom JSON file. Use the same version of the devexpress-dashboard-cli package as the version of DevExpress packages that you use in your application:

    npx devexpress-dashboard-cli@22.1.4 build-theme --input-file dx.generic.light-yellow.json

    This generates the following CSS files and their minified versions:

    • dx.light-yellow.css
    • dx-analytics.light-yellow.css
    • dx-dashboard.light-yellow.css
    • dx.light-yellow.min.css
    • dx-analytics.light-yellow.min.css
    • dx-dashboard.light-yellow.min.css


    The devexpress-dashboard-cli package version should match the version of other DevExpress packages used in your application. To check the version for which you generated the CSS files, open the dx-dashboard.<theme-name>.css file and find the version number in the comments.

Color Constants

The Web Dashboard uses color constants to paint the control’s elements. The colors of the color constants listed in the table below can be customized. Changes to specific dashboard elements’ colors do not affect the basic DevExtreme colors.

Show Table
Color Constant Description
@dashboard-surface-bg The background color of the dashboard surface.
@dashboard-item-selected-bg The background color of the selected element in a dashboard item.
@dashboard-item-hover-bg The background color applied to elements in a dashboard item when you hover over them.
@dashboard-overlay-shader-bg The shading background color.
@dashboard-border-color A more contrast border color.
@dashboard-border-sub-color A less contrast border color.
@dashboard-shadow The color of the shadow used for the control’s elements (for example, when you hover over icons in the Toolbox).
@dashboard-shadow-border-color The color of the border that appears with the shadow.
@dashboard-tab-hover-bg The background color of the inactive hovered tab page’s header.
@dashboard-tab-inactive-bg The background color of the inactive tab page.
@dashboard-info-toast-bg The background color of the information notification toast.
@dashboard-info-toast-color The text color of the information notification toast.
@dashboard-item-menu-bg The background color of the dashboard item menu.
@dashboard-item-menu-icon-color The primary color of the dashboard item menu’s icons.
@dashboard-item-menu-icon-sub-color The additional color of the dashboard item menu’s icons.
@dashboard-item-menu-remove-icon-color The color of the dashboard item menu’s Delete icon.
@dashboard-item-menu-separator-color The color of the dashboard item menu’s separator.
@dashboard-item-menu-item-border-color The border color of a dashboard item. The border appears when you hover or select a dashboard item in the [Designer]> (xref:119283#designer-and-viewer-modes) mode.
@dashboard-item-binding-menu-bg The background color of the dashboard item’s Binding menu.
@dashboard-item-binding-menu-filter-section-bg The background color of the Binding menu’s Filter section.
@dashboard-menu-bg The dashboard menu‘s background color.
@dashboard-menu-color The dashboard menu’s basic color.
@dashboard-menu-header-bg The background color of the dashboard menu’s header.
@dashboard-menu-header-color The primary color of the dashboard menu’s header.
@dashboard-menu-icon-color The color of the dashboard menu’s icons (for example, the X icon used to close the menu).
@dashboard-menu-selected-bg The background color of the selected element in the dashboard’s menu.
@dashboard-menu-selected-color The color of the selected dashboard menu’s element.
@dashboard-menu-hover-bg The background color applied to elements in a dashboard menu when you hover over them.
@dashboard-menu-hover-color The primary color applied to elements in a dashboard menu when you hover over them.
@dashboard-toolbar-color The text color of the dashboard item caption and dashboard title.

Apply the Custom Theme

A custom theme’s icons should be in the same folder as the theme’s CSS files. For npm, the icons folder is node_modules/devextreme/dist/css. In other cases, the folder is in the same directory as the predefined themes. Copy the icons folder to the directory that contains your theme.


To apply the created custom theme, register the generated CSS files instead of the default styles. You need to disable automatic script and style registration mechanism and register all third-party libraries manually.

  1. Create the Content | custom-themes folder in the project and put the generated CSS files in the created folder.

  2. Add the generated CSS files instead of corresponding existing CSS files in the bundleconfig.json file:

        "outputFileName": "wwwroot/css/site.min.css",
        "inputFiles": [
        "minify": { "enabled": false, "adjustRelativePaths": false }

    You can also attach minified CSS files (for example, dx.light-yellow.min.css).

  3. Modify the AddDevExpressControls method call in the Startup.cs file:

    services.AddDevExpressControls(settings => settings.Resources = ResourcesType.None);

The image below shows the Web Dashboard with a custom Light Yellow theme.