fix(FEC-7518): captions container overflows (#147)

captions container overflows outside of player container, this ensures we don't do it.
The issue is when we move the container when hovering or pausing the player and then we need to sync the bottom bar and captions container views.

src/styles/_shell.scss

@@ -8,6 +8,8 @@
   overflow: hidden;
   user-select: none;
   width: 100%;
+  height: 100%;
+  position: relative;
 
   &:-webkit-full-screen {
     width: 100%;