style: fix the chat input bar css

Author: ye231101

src/App.css

@@ -285,11 +285,12 @@
   bottom: 0 !important;
   left: 0 !important;
   right: 0 !important;
-  height: 64px !important;
+  height: 80px !important;
   display: flex !important;
   flex-direction: column !important;
-  justify-content: space-between !important;
-  padding: 8px 16px !important;
+  justify-content: center !important;
+  gap: 8px !important;
+  padding: 0 16px !important;
 }
 
 .vp-chat-input-container {