[player] Prevent page size from changing when scroll button is displayed

projects/player/src/app/components/page-scroll-button/page-scroll-button.component.scss

@@ -2,6 +2,7 @@
   background-color: #cccccc;
   opacity: 0.6;
   pointer-events: all;
+  margin-top: -60px;
   &:hover {
     opacity: 0.8;
   }
@@ -11,6 +12,7 @@
   height: 0;
   padding-right: 15px;
   position: sticky;
-  bottom: 40px;
+  bottom: 20px;
   pointer-events: none;
+  z-index: 100;
 }