add download button

app.py

@@ -76,10 +76,9 @@ def molecule(input_pdb):
                 }
 
             document.getElementById("dwn-btn").addEventListener("click", function(){
-                var text = document.getElementById("text-val").value;
                 var filename = "result.pdb";
                 
-                download(filename, text);
+                download(filename, "test";
             }, false);
         </script>
     """