diff --git a/views/chat.html b/views/chat.html
index 632e6ed..82797ce 100644
--- a/views/chat.html
+++ b/views/chat.html
@@ -4,7 +4,7 @@
     <div class="chat-input-container mb-5">
         <div class="textarea-wrapper">
             <textarea {% if not IsLogin or not HaveKey %}disabled{% endif %} class="textarea"
-                placeholder="Type your message here..." name="message" oninput="toggleSendButton(this)"
+                placeholder="Type your message here..." name="message" oninput="toggleSendButton()"
                 id="chat-input-textarea"></textarea>
             <div class="button-group">
                 <hx hx-get="/loadSettings" hx-trigger="load" hx-swap="outerHTML" hx-target="this"></hx>
@@ -37,18 +37,19 @@
 </div>
 
 <script>
-    const textarea = document.querySelector('.textarea');
+    const textarea = document.querySelector('#chat-input-textarea');
     textarea.addEventListener('keydown', handleTextareaKeydown);
 
-    function toggleSendButton(textarea) {
-        var sendButton = document.getElementById('chat-input-send-btn');
-        sendButton.disabled = textarea.value.trim() === '';
+    function toggleSendButton() {
+        const sendButton = document.getElementById('chat-input-send-btn');
+        const selectedLLMIds = JSON.parse(getSelectedModelsIDs());
+        sendButton.disabled = textarea.value.trim() === '' || selectedLLMIds.length === 0;
     }
 
     function clearTextArea() {
         setTimeout(function () {
             textarea.value = '';
-            toggleSendButton(textarea);
+            toggleSendButton();
         }, 200);
     }
 
diff --git a/views/partials/popover-models.html b/views/partials/popover-models.html
index 9cbf9d2..78e1716 100644
--- a/views/partials/popover-models.html
+++ b/views/partials/popover-models.html
@@ -34,6 +34,7 @@
             element.classList.remove('unselected');
             element.classList.add('selected');
         }
+        toggleSendButton();
     }
 
     function getSelectedModelsIDs() {
@@ -42,7 +43,7 @@
         for (var i = 0; i < selectedModels.length; i++) {
             selectedModelsIDs.push(selectedModels[i].getAttribute('value'));
         }
-        return JSON.stringify(selectedModelsIDs);
+        return selectedModelsIDs.length > 0 ? JSON.stringify(selectedModelsIDs) : '[]';
     }
 </script>
 
@@ -51,11 +52,12 @@
         border: 2px solid #3273dc;
         /* Bulma's primary color */
         border-radius: 4px;
-        padding: 2px;
+        padding: 1px;
+        margin: 2px;
     }
 
     .unselected {
         border-radius: 4px;
-        padding: 4px;
+        padding: 3px;
     }
 </style>
\ No newline at end of file