grey styling to be consistent with trilium

app/src/main/res/layout/activity_main.xml

@@ -15,7 +15,6 @@
             android:id="@+id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
-            android:background="?attr/colorPrimary"
             app:popupTheme="@style/AppTheme.PopupOverlay" />
 
     </android.support.design.widget.AppBarLayout>

app/src/main/res/layout/activity_send_note.xml

@@ -41,6 +41,7 @@
         android:layout_marginBottom="32dp"
         android:layout_marginEnd="32dp"
         android:clickable="true"
+        app:backgroundTint="@android:color/darker_gray"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:srcCompat="@android:drawable/ic_menu_send" />

app/src/main/res/values/colors.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="colorPrimary">#3F51B5</color>
-    <color name="colorPrimaryDark">#303F9F</color>
+    <color name="colorPrimary">#aaaaaa</color>
+    <color name="colorPrimaryDark">#aaaaaa</color>
     <color name="colorAccent">#FF4081</color>
 </resources>