Horizontal Rule

.horizontal-rule {
  background-color: var(--horizontal-rule-color, var(--line-color-secondary));
  block-size: var(--horizontal-rule-thickness, 1px);
  border-radius: var(--horizontal-rule-border-radius, 0);
  clear: both;
  display: block;
  inline-size: var(--horizontal-rule-width, 100%);
  margin-block: var(--horizontal-rule-margin-block, 0);
  margin-inline: var(--horizontal-rule-margin-inline, auto);
}