Add scroll bar to accordion tab

ui.R

@@ -167,6 +167,25 @@ ui <- function() {
           .accordion-button:hover h4 {
             color: #666666 !important; /* Ein weiches Dunkelgrau beim Hovern */
           }
+          .accordion-scroll-container {
+          /* This says: Max height is 70% of the screen height */
+          max-height: 65vh !important;
+          /* Scrollbar only appears when content is too long */
+          overflow-y: auto !important; 
+          overflow-x: hidden !important;
+          /* Smoothness */
+          padding-right: 5px;
+          /* Adds a little 'breathing room' at the bottom so the last 
+          panel isn't hugging the edge of the card */
+          padding-bottom: 50px !important;
+          /* Ensures the container stays fluid */
+          display: block;
+          }
+          .accordion-scroll-container::-webkit-scrollbar-thumb {
+          background: #e2e8f0; /* Very soft grey */
+          border: 2px solid #ffffff; /* Gives it a 'floating' look */
+          border-radius: 10px;
+          }
         ")
       )
     ),