Prerequisite: install and enable https://wordpress.org/plugins/php-text-widget/

insert the following code in a text widget, notice $page_id = 803; you need to make this number according to your page ID

class=”uk-button uk-button-primary” this applies to yootheme warp7 framework

Read more -> this can be changed to something else like “View  More” or change language

<?php
$page_id = 803;
$page_data = get_page( $page_id );
$content = $page_data->the_excerpt;
$title = $page_data->post_title;
echo ‘<h3>’. $page_data->post_title .'</h3>’;
echo the_excerpt( $page_id );
echo ‘<a class=”uk-button uk-button-primary” href=”‘.get_permalink( $post_id ).'”>Read more</a>’;
?>