add_filter( 'get_the_excerpt', function( $post_excerpt, $post ){

    $find = '<!--more-->';
    $replace = sprintf( '<div class="more-link-wrap mt-3"><a href="%1$s" class="more-link">%2$s</a></div>',
        esc_url( get_permalink( $post->ID ) ),
        esc_html__( 'Continue reading', 'streamtube' )
    );

    return str_replace( $find, $replace, $post_excerpt );

}, 10, 2 );