Autocomplete restyling

src/skins/vector/css/matrix-react-sdk/views/rooms/MessageComposer.css

@@ -60,6 +60,12 @@ limitations under the License.
     color: #888;
 }
 
+.mx_MessageComposer_input_wrapper {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+}
+
 .mx_MessageComposer_input {
     flex: 1;
     vertical-align: middle;