diff --git a/src/fullcalendar/eventSources/eventSourceFunction.js b/src/fullcalendar/eventSources/eventSourceFunction.js
index 04babcc08e..5a6be1c25a 100644
--- a/src/fullcalendar/eventSources/eventSourceFunction.js
+++ b/src/fullcalendar/eventSources/eventSourceFunction.js
@@ -9,8 +9,6 @@ import useTasksStore from '@/store/unscheduledTasks.js'
 import { getAllObjectsInTimeRange } from '@/utils/calendarObject.js'
 import {
 	getHexForColorName,
-	hexToRGB,
-	isLight,
 } from '@/utils/color.js'
 import logger from '@/utils/logger.js'
 /**
@@ -169,7 +167,6 @@ export function eventSourceFunction(calendarObjects, calendar, start, end, timez
 					calendarOrder: calendar.order,
 					calendarName: calendar.displayName,
 					calendarId: calendar.id,
-					darkText: isLight(hexToRGB(calendar.color)),
 					objectType: object.name,
 					percent: object.percent || null,
 					davUrl: calendarObject.dav.url,
diff --git a/src/fullcalendar/rendering/eventDidMount.js b/src/fullcalendar/rendering/eventDidMount.js
index a73f16824e..32279d41d2 100644
--- a/src/fullcalendar/rendering/eventDidMount.js
+++ b/src/fullcalendar/rendering/eventDidMount.js
@@ -5,6 +5,7 @@
 import { getCanonicalLocale, translate as t } from '@nextcloud/l10n'
 import { errorCatch } from '@/fullcalendar/utils/errors.js'
 import { formatDateWithTimezone, isMultiDayAllDayEvent } from '@/utils/date.js'
+import { createSvgIconElement } from '@/utils/svg.ts'
 
 /**
  * Build time description for all-day events
@@ -136,11 +137,9 @@ export default errorCatch(function({ event, el }) {
 		const notificationIcon = document.createElement('span')
 		notificationIcon.classList.add('icon-event-reminder')
 		notificationIcon.setAttribute('aria-hidden', 'true')
-		if (event.extendedProps.darkText) {
-			notificationIcon.classList.add('icon-event-reminder--dark')
-		} else {
-			notificationIcon.classList.add('icon-event-reminder--light')
-		}
+		// From node_modules/vue-material-design-icons/Bell.vue
+		const bellIcon = createSvgIconElement('M21,19V20H3V19L5,17V11C5,7.9 7.03,5.17 10,4.29C10,4.19 10,4.1 10,4A2,2 0 0,1 12,2A2,2 0 0,1 14,4C14,4.1 14,4.19 14,4.29C16.97,5.17 19,7.9 19,11V17L21,19M14,21A2,2 0 0,1 12,23A2,2 0 0,1 10,21')
+		notificationIcon.appendChild(bellIcon)
 		el.firstChild.appendChild(notificationIcon)
 	}
 
@@ -305,11 +304,13 @@ export default errorCatch(function({ event, el }) {
 		event.extendedProps.attendeeCount >= 1
 		&& !el.classList.contains('fc-event-nc-task')
 	) {
-		prependTitleIcon(el, 'M40-160v-112q0-34 17.5-62.5T104-378q62-31 126-46.5T360-440q66 0 130 15.5T616-378q29 15 46.5 43.5T680-272v112H40Zm640 0v-112q0-51-26-95.5T586-441q51 6 98 20.5t84 35.5q36 20 57 44.5t21 52.5v112H680ZM360-480q-66 0-113-47t-47-113q0-66 47-113t113-47q66 0 113 47t47 113q0 66-47 113t-113 47Zm400-160q0 66-47 113t-113 47q-11 0-28-2.5t-28-5.5q27-32 41.5-71t14.5-81q0-42-14.5-81T544-792q14-5 28-6.5t28-1.5q66 0 113 47t47 113Z')
+		// From node_modules/vue-material-design-icons/AccountMultiple.vue
+		prependTitleIcon(el, 'M16 17V19H2V17S2 13 9 13 16 17 16 17M12.5 7.5A3.5 3.5 0 1 0 9 11A3.5 3.5 0 0 0 12.5 7.5M15.94 13A5.32 5.32 0 0 1 18 17V19H22V17S22 13.37 15.94 13M15 4A3.39 3.39 0 0 0 13.07 4.59A5 5 0 0 1 13.07 10.41A3.39 3.39 0 0 0 15 11A3.5 3.5 0 0 0 15 4Z')
 	}
 
 	if (el.classList.contains('fc-event-nc-all-declined')) {
-		prependTitleIcon(el, 'm40-120 440-760 440 760H40Zm440-120q17 0 28.5-11.5T520-280q0-17-11.5-28.5T480-320q-17 0-28.5 11.5T440-280q0 17 11.5 28.5T480-240Zm-40-120h80v-200h-80v200Z')
+		// From node_modules/vue-material-design-icons/Alert.vue
+		prependTitleIcon(el, 'M13 14H11V9H13M13 18H11V16H13M1 21H23L12 2L1 21Z')
 	}
 
 	if (el.classList.contains('fc-event-nc-tentative')) {
@@ -374,16 +375,7 @@ function prependTitleIcon(el, svgPath) {
 		}
 	}
 
-	const svgNS = 'http://www.w3.org/2000/svg'
-	const svgElement = document.createElementNS(svgNS, 'svg')
-	svgElement.setAttribute('viewBox', '0 -960 960 960')
-	const pathElement = document.createElementNS(svgNS, 'path')
-	pathElement.setAttribute('d', svgPath)
-	svgElement.appendChild(pathElement)
-	svgElement.style.fill = el.style.borderColor
-	svgElement.style.width = '1em'
-	svgElement.style.marginBottom = '0.2em'
-	svgElement.style.verticalAlign = 'middle'
+	const svgElement = createSvgIconElement(svgPath)
 	titleElement.insertBefore(svgElement, titleElement.firstChild)
 }
 
diff --git a/src/styles/fullcalendar.scss b/src/styles/fullcalendar.scss
index ad39863b13..0dd7ad4b03 100644
--- a/src/styles/fullcalendar.scss
+++ b/src/styles/fullcalendar.scss
@@ -194,19 +194,11 @@
 	}
 
 	// Reminder icon on events with alarms set
-	.fc-event-nc-alarms {
+	&.fc-event-nc-alarms {
 		.icon-event-reminder {
-			background-color: inherit;
-			background-position: right;
 			position: absolute;
 			top: 0;
 			inset-inline-end: 0;
-			&--light {
-				background-image: var(--icon-calendar-reminder-fffffe)
-			}
-			&--dark {
-				background-image: var(--icon-calendar-reminder-000001)
-			}
 		}
 	}
 
@@ -243,7 +235,10 @@
 	}
 
 	svg {
+		width: 1em;
 		margin-inline-end: 2px;
+		fill: var(--color-main-text);
+		vertical-align: middle;
 	}
 
 	@media only screen and (max-width: 767px) {
@@ -373,4 +368,3 @@
 [data-themes*="highcontrast"] {
 	@include _fc-high-contrast-events;
 }
-
diff --git a/src/utils/color.js b/src/utils/color.js
index 298b5524fd..9db53a1a7e 100644
--- a/src/utils/color.js
+++ b/src/utils/color.js
@@ -21,16 +21,6 @@ export function isLight({ red, green, blue }) {
 	return (brightness > 130)
 }
 
-/**
- * Get a text-color that's readable on a given background color
- *
- * @param {string} hexColor The hex color to get a text color for
- * @return {string} the matching text color
- */
-export function generateTextColorForHex(hexColor) {
-	return generateTextColorForRGB(hexToRGB(hexColor))
-}
-
 /**
  * Get a text-color that's readable on a given background color
  *
@@ -44,20 +34,6 @@ export function generateTextColorForRGB({ red, green, blue }) {
 	return isLight({ red, green, blue }) ? '#000000' : '#FAFAFA'
 }
 
-/**
- * Convert hex string to RGB
- *
- * @param {string} hexColor The hex color to convert
- * @return {string} the RGB result
- */
-export function hexToRGB(hexColor) {
-	if (hexColor === null) {
-		return { red: 0, green: 0, blue: 0 }
-	}
-	const [red, green, blue] = convert.hex.rgb(hexColor.slice(1))
-	return { red, green, blue }
-}
-
 /**
  * Generates a hex color based on RGB string
  *
diff --git a/src/utils/svg.ts b/src/utils/svg.ts
new file mode 100644
index 0000000000..3815c947ce
--- /dev/null
+++ b/src/utils/svg.ts
@@ -0,0 +1,22 @@
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+/**
+ * Allocates a DOM element containing the given SVG icon
+ * It is recommended to always use SVG icons from vue-material-design-icons and
+ * to specify the original file from which SVG has been retrieved
+ *
+ * @param content SVG path data of the icon
+ * @return The element to append to the DOM
+ */
+export function createSvgIconElement(content: string): SVGSVGElement {
+	const svgNS = 'http://www.w3.org/2000/svg'
+	const svgElement = document.createElementNS(svgNS, 'svg')
+	svgElement.setAttribute('viewBox', '0 0 24 24')
+	const pathElement = document.createElementNS(svgNS, 'path')
+	pathElement.setAttribute('d', content)
+	svgElement.appendChild(pathElement)
+	return svgElement
+}
diff --git a/tests/javascript/unit/fullcalendar/eventSources/freeBusyResourceEventSourceFunction.test.js b/tests/javascript/unit/fullcalendar/eventSources/freeBusyResourceEventSourceFunction.test.js
index f70eed721c..5806fe8ca0 100644
--- a/tests/javascript/unit/fullcalendar/eventSources/freeBusyResourceEventSourceFunction.test.js
+++ b/tests/javascript/unit/fullcalendar/eventSources/freeBusyResourceEventSourceFunction.test.js
@@ -8,7 +8,6 @@ import { eventSourceFunction } from '@/fullcalendar/eventSources/eventSourceFunc
 import useSettingsStore from '@/store/settings.js'
 import { getAllObjectsInTimeRange } from '@/utils/calendarObject.js'
 import {
-	generateTextColorForHex,
 	getHexForColorName,
 	isLight,
 } from '@/utils/color.js'
@@ -20,7 +19,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 	beforeEach(() => {
 		translate.mockClear()
 		getHexForColorName.mockClear()
-		generateTextColorForHex.mockClear()
 		getAllObjectsInTimeRange.mockClear()
 		setActivePinia(createPinia())
 	})
@@ -30,8 +28,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 			.mockImplementation((app, str) => str)
 		getHexForColorName
 			.mockImplementation(() => '#ff0000')
-		generateTextColorForHex
-			.mockImplementation(() => '#eeeeee')
 		isLight
 			.mockImplementation(() => false)
 
@@ -210,7 +206,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 					calendarId: 'Calendar id 456',
 					calendarName: 'Calendar displayname',
 					calendarOrder: 1337,
-					darkText: false,
 					davUrl: 'url1',
 					objectType: 'VEVENT',
 					percent: null,
@@ -234,7 +229,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 					calendarId: 'Calendar id 456',
 					calendarName: 'Calendar displayname',
 					calendarOrder: 1337,
-					darkText: false,
 					davUrl: 'url1',
 					objectType: 'VEVENT',
 					percent: null,
@@ -258,7 +252,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 					calendarId: 'Calendar id 456',
 					calendarName: 'Calendar displayname',
 					calendarOrder: 1337,
-					darkText: false,
 					davUrl: 'url1',
 					objectType: 'VEVENT',
 					percent: null,
@@ -282,7 +275,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 					calendarId: 'Calendar id 456',
 					calendarName: 'Calendar displayname',
 					calendarOrder: 1337,
-					darkText: false,
 					davUrl: 'url2',
 					objectType: 'VEVENT',
 					percent: null,
@@ -306,7 +298,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 					calendarId: 'Calendar id 456',
 					calendarName: 'Calendar displayname',
 					calendarOrder: 1337,
-					darkText: false,
 					davUrl: 'url4',
 					objectType: 'VEVENT',
 					percent: null,
@@ -359,8 +350,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 		expect(getHexForColorName).toHaveBeenCalledTimes(1)
 		expect(getHexForColorName).toHaveBeenNthCalledWith(1, 'red')
 
-		expect(generateTextColorForHex).toHaveBeenCalledTimes(0)
-
 		// Make sure the following dates have not been touched
 		expect(event11Start.getFullYear()).toEqual(2020)
 		expect(event11Start.getMonth()).toEqual(1)
@@ -439,8 +428,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 			.mockImplementation((app, str) => str)
 		getHexForColorName
 			.mockImplementation(() => '#ff0000')
-		generateTextColorForHex
-			.mockImplementation(() => '#eeeeee')
 		isLight
 			.mockImplementation(() => false)
 
@@ -608,7 +595,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 				calendarName: 'Calendar displayname',
 				calendarOrder: 1337,
 				canModifyAllDay: false,
-				darkText: false,
 				davUrl: 'url1',
 				objectId: '1',
 				vobjectId: '1',
@@ -633,7 +619,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 				calendarName: 'Calendar displayname',
 				calendarOrder: 1337,
 				canModifyAllDay: false,
-				darkText: false,
 				davUrl: 'url1',
 				objectId: '1',
 				vobjectId: '2',
@@ -658,7 +643,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 				calendarName: 'Calendar displayname',
 				calendarOrder: 1337,
 				canModifyAllDay: false,
-				darkText: false,
 				davUrl: 'url1',
 				objectId: '1',
 				vobjectId: '3',
@@ -683,7 +667,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 				calendarName: 'Calendar displayname',
 				calendarOrder: 1337,
 				canModifyAllDay: false,
-				darkText: false,
 				davUrl: 'url1',
 				objectId: '1',
 				vobjectId: '4',
@@ -708,7 +691,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 				calendarName: 'Calendar displayname',
 				calendarOrder: 1337,
 				canModifyAllDay: false,
-				darkText: false,
 				davUrl: 'url1',
 				objectId: '1',
 				vobjectId: '5',
@@ -754,7 +736,6 @@ describe('fullcalendar/freeBusyResourceEventSourceFunction test suite', () => {
 		expect(getAllObjectsInTimeRange).toHaveBeenNthCalledWith(1, calendarObjects[0], start, end)
 
 		expect(getHexForColorName).toHaveBeenCalledTimes(0)
-		expect(generateTextColorForHex).toHaveBeenCalledTimes(0)
 	})
 
 	it('should filter events by search query matching title, location, description, attendee, and organizer', () => {
diff --git a/tests/javascript/unit/fullcalendar/rendering/eventDidMount.test.js b/tests/javascript/unit/fullcalendar/rendering/eventDidMount.test.js
index 754938a001..62f8126480 100644
--- a/tests/javascript/unit/fullcalendar/rendering/eventDidMount.test.js
+++ b/tests/javascript/unit/fullcalendar/rendering/eventDidMount.test.js
@@ -41,39 +41,7 @@ describe('fullcalendar/eventDidMount test suite', () => {
 		expect(el.dataset.recurrenceId).toEqual(undefined)
 	})
 
-	it('should add an alarm bell icon if event has an alarm - dark', () => {
-		const fcTime = document.createElement('span')
-		fcTime.classList.add('fc-time')
-		fcTime.appendChild(document.createTextNode('2pm'))
-		const fcTitle = document.createElement('span')
-		fcTitle.classList.add('fc-title')
-		fcTitle.appendChild(document.createTextNode('Title 123'))
-
-		const fcContent = document.createElement('div')
-		fcContent.classList.add('fc-content')
-		fcContent.appendChild(fcTime)
-		fcContent.appendChild(fcTitle)
-
-		const el = document.createElement('div')
-		el.classList.add('fc-event-nc-alarms')
-		el.appendChild(fcContent)
-
-		const event = {
-			source: {},
-			extendedProps: {
-				objectId: 'object123',
-				recurrenceId: 'recurrence456',
-				darkText: true,
-				percent: 100,
-			},
-		}
-
-		eventRender({ event, el })
-
-		expect(el.outerHTML).toEqual('<div class="fc-event-nc-alarms" aria-label="undefined" data-object-id="object123" data-recurrence-id="recurrence456"><div class="fc-content"><span class="fc-time">2pm</span><span class="fc-title">Title 123</span><span class="icon-event-reminder icon-event-reminder--dark" aria-hidden="true"></span></div></div>')
-	})
-
-	it('should add an alarm bell icon if event has an alarm - light', () => {
+	it('should add an alarm bell icon if event has an alarm', () => {
 		const fcTime = document.createElement('span')
 		fcTime.classList.add('fc-time')
 		fcTime.appendChild(document.createTextNode('2pm'))
@@ -102,7 +70,8 @@ describe('fullcalendar/eventDidMount test suite', () => {
 
 		eventRender({ event, el })
 
-		expect(el.outerHTML).toEqual('<div class="fc-event-nc-alarms" aria-label="undefined" data-object-id="object123" data-recurrence-id="recurrence456"><div class="fc-content"><span class="fc-time">2pm</span><span class="fc-title">Title 123</span><span class="icon-event-reminder icon-event-reminder--light" aria-hidden="true"></span></div></div>')
+		expect(el.outerHTML).toContain('<div class="fc-event-nc-alarms" aria-label="undefined" data-object-id="object123" data-recurrence-id="recurrence456">')
+		expect(el.outerHTML).toContain('<span class="icon-event-reminder" aria-hidden="true"><svg viewBox="0 0 24 24">')
 	})
 
 	// TODO: fix me later
diff --git a/tests/javascript/unit/utils/color.test.js b/tests/javascript/unit/utils/color.test.js
index 18416e82d5..52f0f0f8eb 100644
--- a/tests/javascript/unit/utils/color.test.js
+++ b/tests/javascript/unit/utils/color.test.js
@@ -4,23 +4,14 @@
  */
 import {
 	detectColor,
-	generateTextColorForHex,
 	generateTextColorForRGB,
 	getClosestCSS3ColorNameForHex,
 	getHexForColorName,
-	hexToRGB,
 	isLight,
 	uidToHexColor,
 } from '@/utils/color.js'
 
 describe('utils/color test suite', () => {
-	it('should provide a function to generate a text-color from an rgb string', () => {
-		expect(generateTextColorForHex('#fff')).toEqual('#000000')
-		expect(generateTextColorForHex('#000')).toEqual('#FAFAFA')
-		expect(generateTextColorForHex('#FF00FF')).toEqual('#FAFAFA')
-		expect(generateTextColorForHex('#00FF00')).toEqual('#000000')
-	})
-
 	it('should provide a function to generate a text-color from rgb values', () => {
 		expect(generateTextColorForRGB({ red: 255, green: 255, blue: 255 })).toEqual('#000000')
 		expect(generateTextColorForRGB({ red: 0, green: 0, blue: 0 })).toEqual('#FAFAFA')
@@ -33,10 +24,6 @@ describe('utils/color test suite', () => {
 		expect(isLight({ red: 0, green: 0, blue: 0 })).toEqual(false)
 	})
 
-	it('should provide a RGB object for a hex string', () => {
-		expect(hexToRGB('#C98879')).toEqual({ red: 201, green: 136, blue: 121 })
-	})
-
 	it('should provide a HEX string for a UID', () => {
 		expect(uidToHexColor('uid123')).toEqual('#C98879')
 		expect(uidToHexColor('')).toEqual('#0082C9')