.wp-block-button.is-style-link {
    color: var(--wp--preset--color--custom-tertiary);
}

.wp-block-button.is-style-link .wp-block-button__link,
.wp-block-button.is-style-link .wp-element-button,
.wp-block-button.is-style-link .wp-block-button__link:hover,
.wp-block-button.is-style-link .wp-element-button:hover,
.wp-block-button.is-style-link .wp-block-button__link:focus,
.wp-block-button.is-style-link .wp-element-button:focus,
.wp-block-button.is-style-link .wp-block-button__link:active,
.wp-block-button.is-style-link .wp-element-button:active,
.wp-block-button.is-style-link .wp-block-button__link:visited,
.wp-block-button.is-style-link .wp-element-button:visited {
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    color: inherit;
    padding: 0;
    text-decoration: underline;
}