notes page finished, messing with theme and navbar things

refilc/lib/theme/colors/utils.dart

@@ -0,0 +1,22 @@
+import 'package:flutter/material.dart';
+
+class ColorsUtils {
+  Color darken(Color color, {double amount = .1}) {
+    assert(amount >= 0 && amount <= 1);
+
+    final hsl = HSLColor.fromColor(color);
+    final hslDark = hsl.withLightness((hsl.lightness - amount).clamp(0.0, 1.0));
+
+    return hslDark.toColor();
+  }
+
+  Color lighten(Color color, {double amount = .1}) {
+    assert(amount >= 0 && amount <= 1);
+
+    final hsl = HSLColor.fromColor(color);
+    final hslLight =
+        hsl.withLightness((hsl.lightness + amount).clamp(0.0, 1.0));
+
+    return hslLight.toColor();
+  }
+}