add_action( 'genesis_loop', 'sk_fixed_cpt_nav' );
function sk_fixed_cpt_nav() {
    global $post;

    $prev_post = get_adjacent_post( true, '', true );

    $next_post = get_adjacent_post( true, '', false ); ?>

    <div class="btn-wrap">
        <a class="prevBtn" href="<?php echo $prev_post->guid; ?>">
            <span class="arrow"></span>
            <span class="button work">
                <span class="arrow-inner"></span>
                <span class="label">
                    <span class="inner-text"><?php echo $prev_post->post_title; ?></span>
                </span>
            </span>
        </a>
        <a class="nextBtn" href="<?php echo $next_post->guid; ?>">
            <span class="arrow"></span>
            <span class="button work">
                <span class="arrow-inner"></span>
                <span class="label">
                    <span class="inner-text"><?php echo $next_post->post_title; ?></span>
                </span>
            </span>
        </a>
    </div>
<?php }