metamask-extension/ui/components/component-library/button-link/button-link.scss

.mm-button-link {
  &:hover:not(&--disabled) {
    color: var(--color-primary-default);
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 4px;
  }

  &:active:not(&--disabled) {
    color: var(--color-primary-alternative);
  }

  &--disabled {
    &:active {
      color: var(--color-primary-default);
    }
  }

  &--type-danger:not(&--disabled) {
    &:hover {
      color: var(--color-error-default);
    }

    &:active {
      color: var(--color-error-alternative);
    }
  }

  &--type-danger#{&}--disabled:active {
    color: var(--color-error-default);
  }

  &--size-auto {
    height: auto;
  }

  &--size-inherit {
    height: auto;
    background-color: transparent;
    vertical-align: top;
    font-family: inherit;
    font-weight: inherit;
    font-size: inherit;
    line-height: inherit;
    letter-spacing: inherit;
  }

  &--size-inherit:hover:not(&--disabled) {
    text-decoration-thickness: auto;
    text-underline-offset: 2px;
  }

  &--loading:hover:not(&--disabled) {
    text-decoration: none;
  }
}