Add basic styling

src/_color-scheme.scss

@@ -0,0 +1,6 @@
+$app-background: #f4f4f4;
+$background: #ffffff;
+$foreground: #000000;
+$font: #333333;
+$grey: #666666;
+$accent: #0098d4;

src/index.scss

@@ -1,3 +1,21 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+@import "color-scheme";
+
 // CSS reset
 
 * {
@@ -5,9 +23,24 @@
   margin: 0;
 }
 
+// Styling for universal elements
+
 html,
 body,
 #root {
   height: 100%;
   width: 100%;
+
+  font-family: Helvetica Neue;
+  font-style: normal;
+
+  background-color: $app-background;
+  color: $font;
+}
+
+h1 {
+  font-weight: bold;
+  font-size: 24px;
+  line-height: 32px;
+  text-align: center;
 }