themes-wordpress/spearhead/assets/sass/_text.scss

.has-link-color a, a {
    border-color: transparent;
    transition: all 0.1s ease;
    text-decoration: none;

    &:hover {
        color: var( --global--color-primary-hover );
        text-decoration: 1px solid underline;
    }
}

.wp-block a,
.entry-content a {
    font-weight: var(--global--link-font-weight);
    border-color: var( --global--color-primary );
    &:hover {
        border-color: transparent;
    }
}