Atlas
.atlas-divider

Divider

Thin rule separating sections. Horizontal by default; add -v for vertical.

.atlas-divider.atlas-divider-v

Horizontal

Above the divider
Below the divider 
<div style="font-size:13px;color:var(--text-secondary);width:320px">
  Above the divider
  <hr class="atlas-divider" style="border:0;border-top:1px solid var(--border-default);margin:12px 0" />
  Below the divider
</div>

Vertical

Left Right 
<span style="font-size:13px;color:var(--text-secondary);display:inline-flex;align-items:center;gap:12px;height:24px">
  Left
  <span class="atlas-divider-v" style="display:inline-block;width:1px;height:100%;background:var(--border-default)"></span>
  Right
</span>