Bootstrap class: .btn-link

<button type="button" class="btn btn-link">Link</button>

Preview

Sass source

/* _buttons.scss:80 */
.btn-link {
  font-weight: $font-weight-normal;
  color: $link-color;
  background-color: transparent;

  @include hover {
    color: $link-hover-color;
    text-decoration: $link-hover-decoration;
    background-color: transparent;
    border-color: transparent;
  }

  &:focus,
  &.focus {
    text-decoration: $link-hover-decoration;
    border-color: transparent;
    box-shadow: none;
  }

  &:disabled,
  &.disabled {
    color: $btn-link-disabled-color;
    pointer-events: none;
  }

  // No need for an active state here
}

Uses variables

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/* _buttons.scss:80 */
$font-weight-normal
$link-color
$link-hover-color
$link-hover-decoration
$link-hover-decoration
$btn-link-disabled-color

More in Bootstrap Buttons