fix(renderer): reduce white flash on start

We inject a CSS file that applies the theme background color even before
the javascript for the renderer is loaded.

Signed-off-by: Kristóf Marussy <kristof@marussy.com>

2 files changed, 30 insertions, 0 deletions

diff --git a/packages/renderer/src/index.tsx b/packages/renderer/src/index.tsx
index 09b9b74..964494a 100644
--- a/packages/renderer/src/index.tsx
+++ b/packages/renderer/src/index.tsx
@@ -28,6 +28,7 @@ import { addDisposer } from 'mobx-state-tree';
 import React, { Suspense, lazy } from 'react';
 import { createRoot } from 'react-dom/client';
 
+import './style.css';
 import Loading from './components/Loading';
 import ThemeProvider from './components/ThemeProvider';
 import { exposeToReduxDevtools, hotReload } from './devTools';
diff --git a/packages/renderer/src/style.css b/packages/renderer/src/style.css
new file mode 100644
index 0000000..d0bf2fb
--- /dev/null
+++ b/packages/renderer/src/style.css
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C)  2022 Kristóf Marussy <kristof@marussy.com>
+ *
+ * This file is part of Sophie.
+ *
+ * Sophie is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+body {
+  background-color: #fff;
+}
+
+@media (prefers-color-scheme: dark) {
+  body {
+    background-color: #121212;
+  }
+}