feat: style of home and notification screen

lib/utils/timeago.dart

@@ -0,0 +1,25 @@
+import 'dart:core';
+
+class TimeAgo {
+  static String _ceil(double n) => n.ceil().toString();
+
+  static String _pluralize(double time, String unit) {
+    if (time == 1) {
+      return '${_ceil(time)} $unit ago';
+    }
+    return '${_ceil(time)} ${unit}s ago';
+  }
+
+  static String format(DateTime time) {
+    double diff =
+        (DateTime.now().millisecondsSinceEpoch - time.millisecondsSinceEpoch) /
+            1000;
+    if (diff < 3600) {
+      return _pluralize(diff / 60, 'minute');
+    } else if (diff < 86400) {
+      return _pluralize(diff / 3600, 'hour');
+    } else {
+      return _pluralize(diff / 86400, 'day');
+    }
+  }
+}