diff --git a/app/src/main/res/layout/include_message_calendar.xml b/app/src/main/res/layout/include_message_calendar.xml
index fc9d638a19..ea2254b4b0 100644
--- a/app/src/main/res/layout/include_message_calendar.xml
+++ b/app/src/main/res/layout/include_message_calendar.xml
@@ -132,6 +132,7 @@
         android:layout_marginTop="12dp"
         android:drawableEnd="@drawable/twotone_check_24"
         android:drawablePadding="6dp"
+        android:drawableTint="?attr/colorAccept"
         android:text="@string/title_icalendar_accept"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@id/tvAttendees" />
@@ -145,6 +146,7 @@
         android:layout_marginTop="12dp"
         android:drawableEnd="@drawable/twotone_close_24"
         android:drawablePadding="6dp"
+        android:drawableTint="?attr/colorDecline"
         android:text="@string/title_icalendar_decline"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@id/btnCalendarAccept" />
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index 34fb50a494..1bd0de1ffc 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -11,6 +11,8 @@
     <attr name="colorThumb" format="reference" />
     <attr name="colorWarning" format="reference" />
     <attr name="colorBadge" format="reference" />
+    <attr name="colorAccept" format="reference" />
+    <attr name="colorDecline" format="reference" />
     <attr name="colorDrawerScrim" format="reference" />
     <attr name="colorDrawerText" format="reference" />
     <attr name="colorDrawerBackground" format="reference" />
@@ -67,6 +69,9 @@
         <item name="colorWarning">@color/lightColorWarning</item>
         <item name="colorBadge">@color/red</item>
 
+        <item name="colorAccept">@color/colorEncryptDark</item>
+        <item name="colorDecline">@color/red</item>
+
         <item name="colorDrawerScrim">@color/lightColorDrawerScrim</item>
         <item name="colorDrawerText">@color/lightColorDrawerText</item>
         <item name="colorDrawerBackground">@color/lightColorDrawerBackground</item>
@@ -138,6 +143,9 @@
         <item name="colorWarning">@color/darkColorWarning</item>
         <item name="colorBadge">@color/red</item>
 
+        <item name="colorAccept">@color/colorEncryptLight</item>
+        <item name="colorDecline">@color/red</item>
+
         <item name="colorDrawerScrim">@color/darkColorDrawerScrim</item>
         <item name="colorDrawerText">@color/darkColorDrawerText</item>
         <item name="colorDrawerBackground">@color/darkColorDrawerBackground</item>