Chats: Improve minimize animation

app/styles/chats.scss

@@ -9,13 +9,14 @@
   display: flex;
   flex-direction: column;
   z-index: 99999;
+  transition: 0.2s;
 
   &--main {
     height: calc(100vh - 70px);
   }
 
   &--minimized {
-    top: calc(100% - 31px);
+    height: 31px;
   }
 
   &__header {