Fix: Tweaked the Media Bar top position in relation to the app bar height

Theme/assets/add-ons/media-bar-plugin-support-nightly.css

@@ -52,8 +52,8 @@
 
 #slides-container {
     width: calc(100vw - (2 * var(--sidePadding)));
-    height: 60%;
-    top: 8em;
+    height: 62%;
+    top: calc(1.5 * var(--appBarHeight));
     border: var(--defaultBorder);
     border-radius: var(--largerRadius);
     transition: all .125s, border 0s;
@@ -106,4 +106,10 @@
     }
 }
 
+@media (min-width: 75em) {
+    #slides-container {
+        top: calc(.5 * var(--appBarHeight));
+    }
+}
+
 /* this styles the media bar plugin - end */