Branding & Styling Reference

The Inbox component is fully themeable through the appearance prop. This reference covers every level of customization — from dropping in a base theme to building dynamic, severity-aware, brand-perfect styles.

Inspiration: inbox.novu.co showcases pre-built variants like Notion and Reddit.

The `appearance` prop

type Appearance = {
  baseTheme?: BaseTheme;
  variables?: Variables;
  elements?: Record<string, string | StyleObject | ((ctx) => string)>;
  icons?: Record<string, () => ReactNode>;
};

Key	Purpose
`baseTheme`	Start from a predefined theme (e.g. `dark`)
`variables`	Global design tokens (colors, fonts, radius, severity colors)
`elements`	Per-element styles — string, style object, or callback
`icons`	Replace built-in icons with your own React components

When both baseTheme and variables are set, variables win. Styles are auto-injected into <head>. If the Inbox is rendered inside a shadow DOM, styles are scoped to that shadow root.

Base themes

Novu currently ships a dark base theme:

import { Inbox } from "@novu/react";
import { dark } from "@novu/react/themes";

<Inbox
  applicationIdentifier="YOUR_NOVU_APP_ID"
  subscriberId="subscriber-123"
  appearance={{ baseTheme: dark }}
/>

Compose baseTheme + variables to start from a theme and tweak just a few tokens:

appearance={{
  baseTheme: dark,
  variables: { colorPrimary: "#FB4CA3", borderRadius: "12px" },
}}

Variables (design tokens)

Variable	Description
`colorBackground`	Inbox background
`colorForeground`	Primary text color
`colorPrimary`	Accent color for interactive elements
`colorPrimaryForeground`	Text on primary surfaces
`colorSecondary`	Less prominent surfaces
`colorSecondaryForeground`	Text on secondary surfaces
`colorCounter`	Background of unread counters
`colorCounterForeground`	Text inside counters
`colorNeutral`	Borders and neutral surfaces
`colorShadow`	Shadow color
`fontSize`	Base font size
`borderRadius`	Border radius applied across elements
`colorSeverityHigh`	High-severity accent
`colorSeverityMedium`	Medium-severity accent
`colorSeverityLow`	Low-severity accent

appearance={{
  variables: {
    colorBackground: "#0B0B0F",
    colorForeground: "#F4F4F6",
    colorPrimary: "#FB4CA3",
    colorPrimaryForeground: "#FFFFFF",
    colorSecondary: "#1A1A22",
    colorSecondaryForeground: "#A1A1AA",
    colorCounter: "#FB4CA3",
    colorCounterForeground: "#FFFFFF",
    colorNeutral: "#27272A",
    colorShadow: "rgba(0, 0, 0, 0.4)",
    fontSize: "14px",
    borderRadius: "10px",
    colorSeverityHigh: "#E5484D",
    colorSeverityMedium: "#F76808",
    colorSeverityLow: "#3E63DD",
  },
}}

Element-level styling

Each key in appearance.elements accepts:

String of class names — CSS, CSS Modules, Tailwind
Style object — inline CSS
Callback — (context) => string returning class names, evaluated on every render with the relevant context (notification, unreadCount, preference, schedule)

Inline style object

appearance={{
  elements: {
    notificationSubject: { color: "#ff0000", fontWeight: 600 },
  },
}}

Tailwind classes

appearance={{
  elements: {
    bellIcon: "p-4 bg-white rounded-full",
    notification: "bg-white rounded-lg shadow-sm hover:shadow-md hover:bg-gray-50",
    notificationPrimaryAction__button: "bg-pink-500 text-white px-3 py-1 rounded",
  },
}}

CSS Modules

/* inbox.module.css */
.bellIcon {
  padding: 1rem;
  background-color: white;
  border-radius: 50%;
}
.bellIcon:hover { background-color: #f9fafb; }

.notification {
  background: white;
  border-radius: 0.5rem;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

import styles from "./inbox.module.css";

appearance={{
  elements: {
    bellIcon: styles.bellIcon,
    notification: styles.notification,
  },
}}

Dynamic styling via callbacks

Callbacks receive contextual data and return class names. Use them for state-aware styles (unread count, notification severity, payload data):

appearance={{
  elements: {
    bellIcon: ({ unreadCount }) => {
      if (unreadCount.total > 10) {
        return "[--bell-gradient-start:var(--color-red-500)] [--bell-gradient-end:var(--color-red-500)]";
      }
      if (unreadCount.total > 0) {
        return "[--bell-gradient-start:var(--color-yellow-500)] [--bell-gradient-end:var(--color-yellow-500)]";
      }

      return "[--bell-gradient-start:var(--color-gray-500)] [--bell-gradient-end:var(--color-gray-500)]";
    },
    notification: ({ notification }) =>
      notification.data?.priority === "high" ? "bg-red-50 ring-1 ring-red-300" : "",
    severityHigh__notificationBar: ({ notification }) =>
      notification.read ? "opacity-50" : "opacity-100",
  },
}}

Common element keys

Element	Key
Notification container	`notification`
Notification subject text	`notificationSubject`
Notification body text	`notificationBody`
Notification image / icon	`notificationImage`
Notification date	`notificationDate`
Notification list	`notificationList`
Primary action button	`notificationPrimaryAction__button`
Secondary action button	`notificationSecondaryAction__button`
Archive button	`notificationArchive__button`
Snooze button	`notificationSnooze__button`
Mark unread button	`notificationUnread__button`
Bell icon	`bellIcon`
Bell container	`bellContainer`
Bell dot (unread indicator)	`bellDot`
Popover content	`popoverContent`
Preferences button	`preferences__button`
Schedule container	`scheduleContainer`
Schedule header	`scheduleHeader`
Schedule body / table	`scheduleBody`, `scheduleTable`

To find any element key, inspect the DOM. Class names starting with nv- (visible just before a 🔔 emoji in DevTools) map to keys in elements. Drop the nv- prefix.

Callback context signatures

Element group	Context
`bellIcon`, `bellContainer`, `bellDot`, `bellSeverityGlow`, `severity*__bellContainer`	`{ unreadCount: { total: number; severity: Record<string, number> } }`
`notification`, `notification`, `severity__notification*`, `notificationDot`	`{ notification: Notification }`
`notificationList`, `notificationListContainer`	`{ notifications: Notification[] }`
`workflow*`, `channelsContainer`, `channelName`	`{ preference: Preference }`
`channelContainer`, `channelLabelContainer`, `channelIconContainer`, `channelLabel`, `channelSwitchContainer`, `channel__icon`	`{ preference?: Preference; preferenceGroup?: { name: string; preferences: Preference[] } }`
`preferencesGroup*`	`{ preferenceGroup: { name: string; preferences: Preference[] } }`
`preferencesContainer`	`{ preferences?: Preference[]; groups: Array<{ name: string; preferences: Preference[] }> }`
`schedule`, `dayScheduleCopy`, `timeSelect*`	`{ schedule?: Schedule }`

Severity styling

Notifications expose three severity levels: high, medium, low. Styling can be applied through variables (global colors) or elements (precise overrides).

Severity variables

Variable	Description
`colorSeverityHigh`	High severity color
`colorSeverityMedium`	Medium severity color
`colorSeverityLow`	Low severity color

appearance={{
  variables: {
    colorSeverityHigh: "#E5484D",
    colorSeverityMedium: "#F76808",
    colorSeverityLow: "#3E63DD",
  },
}}

Updating these automatically restyles both the notification accent bar and the bell glow.

Severity element keys

Key	Description
`severityHigh__bellContainer`	Bell container for high severity
`severityMedium__bellContainer`	Bell container for medium severity
`severityLow__bellContainer`	Bell container for low severity
`bellSeverityGlow`	Base bell glow style
`severityGlowHigh__bellSeverityGlow`	Glow for high severity
`severityGlowMedium__bellSeverityGlow`	Glow for medium severity
`severityGlowLow__bellSeverityGlow`	Glow for low severity
`severityHigh__notification`	High severity notification row
`severityMedium__notification`	Medium severity notification row
`severityLow__notification`	Low severity notification row
`notificationBar`	Vertical bar on the left of a notification
`severityHigh__notificationBar`	Bar for high severity
`severityMedium__notificationBar`	Bar for medium severity
`severityLow__notificationBar`	Bar for low severity

appearance={{
  elements: {
    severityHigh__notificationBar: { backgroundColor: "red" },
    severityHigh__bellContainer: "ring-2 ring-red-500",
    severityGlowHigh__bellSeverityGlow: "bg-red-500/40 blur-md",
  },
}}

By default the bell takes the color of the highest-severity unread notification.

Custom icons

Replace built-in icons with anything that renders to a React node:

import { Inbox } from "@novu/react";
import {
  RiSettings3Fill,
  RiArrowDownLine,
  RiNotification3Fill,
} from "react-icons/ri";

<Inbox
  applicationIdentifier="YOUR_NOVU_APP_ID"
  subscriberId="subscriber-123"
  appearance={{
    icons: {
      bell: () => <RiNotification3Fill />,
      cogs: () => <RiSettings3Fill />,
      arrowDown: () => <RiArrowDownLine />,
    },
  }}
/>

Icon keys

Key	Description
`arrowDown`	Down arrow used in drop-downs and expandable sections
`arrowDropDown`	Drop-down arrow in menus and selectors
`arrowLeft`	Left arrow used in pagination/navigation
`arrowRight`	Right arrow used in pagination/navigation
`bell`	Notification bell in the header
`chat`	Chat channel icon in preferences
`check`	Checkmark for selected items
`clock`	Date/time display
`cogs`	Settings/preferences icon
`dots`	Three-dot menu in notification items
`email`	Email channel icon in preferences
`inApp`	In-app channel icon in preferences
`markAsArchived`	Archive notification
`markAsArchivedRead`	Archive + read
`markAsRead`	Mark as read
`markAsUnread`	Mark as unread
`markAsUnarchived`	Unarchive
`push`	Push channel icon in preferences
`sms`	SMS channel icon in preferences
`trash`	Delete
`unread`	Unread indicator
`unsnooze`	Unsnooze indicator

To find more keys, inspect the DOM for class names starting with nv- containing a 🖼️ emoji. The part after nv- is the icon key.

Responsive Inbox

<Inbox
  applicationIdentifier="YOUR_NOVU_APP_ID"
  subscriberId="subscriber-123"
  appearance={{ elements: { popoverContent: "novu-popover-content" } }}
/>

/* global.css */
.novu-popover-content { max-width: 500px; }

@media (max-width: 768px) { .novu-popover-content { max-width: 350px; } }
@media (max-width: 480px) { .novu-popover-content { max-width: 250px; } }
@media (max-width: 320px) { .novu-popover-content { max-width: 200px; } }

For a mobile drawer experience, use the Custom Popover pattern with shadcn’s <Drawer>.

Brand-presets cookbook

Notion-style (light, calm)

appearance={{
  variables: {
    colorBackground: "#FFFFFF",
    colorForeground: "#37352F",
    colorPrimary: "#2383E2",
    colorPrimaryForeground: "#FFFFFF",
    colorSecondary: "#F7F6F3",
    colorSecondaryForeground: "#787774",
    colorNeutral: "#E9E9E7",
    colorShadow: "rgba(15, 15, 15, 0.05)",
    fontSize: "14px",
    borderRadius: "6px",
  },
  elements: {
    notification: "hover:bg-[#F7F6F3] transition-colors",
    notificationSubject: { fontWeight: 600 },
  },
}}

Reddit-style (vibrant)

appearance={{
  variables: {
    colorPrimary: "#FF4500",
    colorPrimaryForeground: "#FFFFFF",
    colorBackground: "#FFFFFF",
    colorForeground: "#1A1A1B",
    colorSecondary: "#F6F7F8",
    colorCounter: "#FF4500",
    colorCounterForeground: "#FFFFFF",
    borderRadius: "16px",
  },
}}

Brand-locked dark

import { dark } from "@novu/react/themes";

appearance={{
  baseTheme: dark,
  variables: {
    colorPrimary: "#FB4CA3",
    colorPrimaryForeground: "#FFFFFF",
    borderRadius: "12px",
  },
}}

Getting Started

Integrate <Inbox />

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SDKs

Developer

Account

Build with AI

Additional Resources

Branding and styling

Branding & Styling Reference

The `appearance` prop

Base themes

Variables (design tokens)

Element-level styling

Inline style object

Tailwind classes

CSS Modules

Dynamic styling via callbacks

Common element keys

Callback context signatures

Severity styling

Severity variables

Severity element keys

Custom icons

Icon keys

Responsive Inbox

Brand-presets cookbook

Notion-style (light, calm)

Reddit-style (vibrant)

Brand-locked dark

​Branding & Styling Reference

​The appearance prop

​Base themes

​Variables (design tokens)

​Element-level styling

​Inline style object

​Tailwind classes

​CSS Modules

​Dynamic styling via callbacks

​Common element keys

​Callback context signatures

​Severity styling

​Severity variables

​Severity element keys

​Custom icons

​Icon keys

​Responsive Inbox

​Brand-presets cookbook

​Notion-style (light, calm)

​Reddit-style (vibrant)

​Brand-locked dark

Branding & Styling Reference

The `appearance` prop

Base themes

Variables (design tokens)

Element-level styling

Inline style object

Tailwind classes

CSS Modules

Dynamic styling via callbacks

Common element keys

Callback context signatures

Severity styling

Severity variables

Severity element keys

Custom icons

Icon keys

Responsive Inbox

Brand-presets cookbook

Notion-style (light, calm)

Reddit-style (vibrant)

Brand-locked dark