<div class="container">
  <span class="vertical-rl">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam purus tortor, tempor quis diam vel, gravida consectetur massa. Sed vel enim nisl. Aliquam cursus tristique turpis, vitae laoreet sem blandit sit amet. Aenean lobortis rutrum pellentesque. Morbi rhoncus erat orci, nec convallis nunc venenatis at.
  </span>
</div>

.vertical-rl {
  writing-mode: vertical-rl;
}
.vertical-lr {
  writing-mode: vertical-lr;
}