Update styles.css

Author: AjayLiu

styles.css

@@ -92,6 +92,13 @@ body {
   background-repeat: no-repeat;
 }
 
+.pixelbeats {
+  background-image: url("pixelbeats.png");
+  background-size: cover;
+  background-position: center;
+  background-repeat: no-repeat;
+}
+
 .game {
   width: 80%;
   margin: 20px auto;