.content-archive-links-single {
    -webkit-column-count: 5; /* Chrome, Safari, Opera */
    -moz-column-count: 5; /* Firefox */
    column-count: 5;
  -webkit-column-width: 150px;
     -moz-column-width: 150px;
          column-width: 150px;
    -webkit-column-gap: 10px; /* Chrome, Safari, Opera */
    -moz-column-gap: 10px; /* Firefox */
    column-gap: 10px;
    -webkit-column-rule: 4px outset #ff00ff; /* Chrome, Safari, Opera */
    -moz-column-rule: 4px outset #ff00ff; /* Firefox */
    column-rule: 4px outset #ff00ff;
}

Resource:

• https://css-tricks.com/guide-responsive-friendly-css-columns/
• https://css-tricks.com/almanac/properties/c/columns/