Add placeholder app icon & change launch color

web/index.html

@@ -31,6 +31,7 @@
 
   <title>frosty</title>
   <link rel="manifest" href="manifest.json">
+  <link rel="stylesheet" type="text/css" href="splash/style.css">
 </head>
 <body>
   <!-- This script installs service_worker.js to provide PWA functionality to
@@ -101,4 +102,4 @@
     }
   </script>
 </body>
-</html>
+</html>

web/splash/style.css

@@ -0,0 +1,43 @@
+body, html {
+  margin:0;
+  height:100%;
+  background: #000000;
+  
+  background-size: 100% 100%;
+}
+
+.center {
+  margin: 0;
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  -ms-transform: translate(-50%, -50%);
+  transform: translate(-50%, -50%);
+}
+
+.contain {
+  display:block;
+  width:100%; height:100%;
+  object-fit: contain;
+}
+
+.stretch {
+  display:block;
+  width:100%; height:100%;
+}
+
+.cover {
+  display:block;
+  width:100%; height:100%;
+  object-fit: cover;
+}
+
+@media (prefers-color-scheme: dark) {
+  body {
+    margin:0;
+    height:100%;
+    background: #000000;
+    
+    background-size: 100% 100%;
+  }
+}