[current results ui] Use transparent widget background colors

Change-Id: Ib82a352723c0e84a466f15e919abf49c0aaf915f
Reviewed-on: https://dart-review.googlesource.com/c/dart_ci/+/162020
Reviewed-by: Alexander Thomas <athom@google.com>
diff --git a/current_results_ui/lib/main.dart b/current_results_ui/lib/main.dart
index 54f3642..e07abbf 100644
--- a/current_results_ui/lib/main.dart
+++ b/current_results_ui/lib/main.dart
@@ -56,7 +56,7 @@
           title: Text('Current Results',
               style: TextStyle(
                   fontSize: 24.0, color: Color.fromARGB(255, 63, 81, 181))),
-          backgroundColor: Colors.white,
+          backgroundColor: Colors.transparent,
           bottom: TabBar(
             tabs: [
               Tab(text: 'ALL'),
diff --git a/current_results_ui/lib/results.dart b/current_results_ui/lib/results.dart
index a38b447..37f94aa 100644
--- a/current_results_ui/lib/results.dart
+++ b/current_results_ui/lib/results.dart
@@ -80,7 +80,7 @@
                     decoration: BoxDecoration(
                       color: counts.containsKey(kind)
                           ? resultColors[kind]
-                          : Colors.white,
+                          : Colors.transparent,
                       shape: BoxShape.circle,
                     ),
                     child: Text('${counts[kind] ?? ''}',