.article { max-width: 900px; }
.article > section { max-width: 720px; }
.article > ele-chat-conversation {
  display: block;
  max-width: 650px;
  margin: 16px 0 46px;
}
@media (max-width: 700px) {
  .article > ele-chat-conversation { max-width: 100%; }
}