Improve loading page color contrast

services/web/public/stylesheets/app/editor.less

@@ -47,6 +47,7 @@
 
 .loading-screen {
 	.full-size;
+	background-color: #fafafa;
 	.container {
 		text-align: center;
 		position: absolute;
@@ -55,6 +56,10 @@
 		width: 400px;
 		margin-left: -200px;
 	}
+	.progress {
+		background-color: white;
+		border: 1px solid @toolbar-border-color;
+	}
 }
 
 .loading-panel {