fix(FEC-12852): When changing the background color of the player, the…

… color is not changing on loading (#721)

solves FEC-12852

src/assets/style.css

@@ -39,7 +39,7 @@
   background-size: contain;
   background-position: center center;
   background-repeat: no-repeat;
-  background-color: #000;
+  background-color: var(--playkit-player-background-color);
   pointer-events: none;
 }