<p class="container">Lorem ipsum dolor sit amet consectetur adipisicing elit. Expedita omnis velit quae provident delectus magni excepturi illo quas error sunt iusto adipisci, nostrum harum porro, consectetur aliquid veniam laborum. Quae, alias dicta.</p>
.container {
  max-width: 640px;
  padding: 16px;
  columns: 2;
  column-gap: normal; /* normal == 1em */
  column-rule: 1em solid royalblue;
  border: 16px solid silver;
}

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