//single-portfolio.php
<div class="container single_page_background">
                        <?php
                        global $post;
                        $args = array( 'posts_per_page' => 1, 'post_type'=> 'portfolio');
                        $myposts = get_posts( $args );
                        foreach( $myposts as $post ) : setup_postdata($post); ?>
                        <div class="row ">
                            <div class="col-md-12">
                                <div class="single_page_title">
                                    <h1><?php the_title();?></h1>
                                </div>
                            </div>
                        </div>
                        <div class="row ">
                            <div class="col-md-8 col-sm-8 col-xs-12">
                                <div class="single_page_img ">
                                    <?php the_excerpt();?>
                                </div>
                            </div>
                            <div class="col-md-4 col-sm-4 col-xs-12">
                                <div class="single_page_description">
                                    <?php the_content();?>
                                </div>
                            </div>
                        </div>
                        <?php endforeach; ?>
            </div>