fix sidebar width and scrolling (#9052)

Co-authored-by: Mario Behling <[email protected]>

Author: adityagarg06

app/styles/components/stream.scss

@@ -79,7 +79,8 @@
   z-index: 1;
 
   @media (max-width: 767px) {
-    width: 100%;
+    width: 75%;
+    overflow-y: auto;
   }
 }