TO:cica2222

thank you for choose our theme –waffle.
So sorry to tell you that CSS typing is out of our support contents.

you can try to coating CSS below.
waffle: home.php

get_header(); ?>

<section id=”primary” class=”content-area”>
<main id=”main” class=”site-main” role=”main”>

<?php

if ( have_posts() ) : ?>

<?php if ( is_home() && ! is_front_page() ) : ?>
<header>
<h1 class=”page-title screen-reader-text”><?php single_post_title(); ?></h1>
</header>
<?php endif; ?>

<?php
// Start the Loop.
while ( have_posts() ) : the_post();

/*
* Include the Post-Format-specific template for the content.
* If you want to override this in a child theme, then include a file
* called content-___.php (where ___ is the Post Format name) and that will be used instead.
*/
get_template_part( ‘content’, get_post_format() );