Remove development styles

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

@@ -28,13 +28,10 @@
 			box-shadow: black 0px 0px 10px;
 		}
 		div.pdf-canvas.pdfng-empty {
-			background-color: @gray-light;
+			background-color: white;
 		}
 		div.pdf-canvas.pdfng-loading {
-			background-color: @gray-lighter;
-		}
-		canvas.pdf-canvas.pdfng-rendering {
-			box-shadow: red 0px 0px 10px;
+			background-color: white;
 		}
 		.page-container {
 			margin: 10px auto;