fix textarea sizing problem;

move down send btn while textbox high;

src/app.scss

@@ -53,6 +53,7 @@ a.is-disabled {
 /* Style the chat input */
 .chat-input {
   overflow-y:hidden;
+  resize: vertical;
 }
 
 $footer-padding: 3rem 1.5rem;

src/lib/Chat.svelte

@@ -426,7 +426,7 @@
   <progress class="progress is-small is-dark" max="100" />
 {/if}
 
-<form class="field has-addons has-addons-right" on:submit|preventDefault={() => submitForm()}>
+<form class="field has-addons has-addons-right is-align-items-flex-end" on:submit|preventDefault={() => submitForm()}>
   <p class="control is-expanded">
     <textarea
       class="input is-info is-focused chat-input"