diff --git a/app/ytdl.py b/app/ytdl.py
index 9d23852..e32892e 100644
--- a/app/ytdl.py
+++ b/app/ytdl.py
@@ -232,7 +232,7 @@ class DownloadQueue:
         if self.config.DOWNLOAD_MODE == 'sequential':
             self.seq_lock = asyncio.Lock()
         elif self.config.DOWNLOAD_MODE == 'limited':
-            self.semaphore = asyncio.Semaphore(self.config.MAX_CONCURRENT_DOWNLOADS)
+            self.semaphore = asyncio.Semaphore(int(self.config.MAX_CONCURRENT_DOWNLOADS))
         
         self.done.load()
 
diff --git a/ui/src/app/app.component.sass b/ui/src/app/app.component.sass
index d5e5a3f..265fdf7 100644
--- a/ui/src/app/app.component.sass
+++ b/ui/src/app/app.component.sass
@@ -99,7 +99,15 @@ td
 
 .modal-header
   border-bottom: 1px solid #eee
+  
 .modal-body
   textarea.form-control
     resize: vertical
-
+ 
+.add-url
+  display: inline-flex
+  align-items: center
+  justify-content: center
+ 
+  .spinner-border
+    margin-right: 0.5rem