style.css

/*
Theme Name: Twenty Nineteen Blocks
Author: the WordPress team
Author URI: https://wordpress.org/
Description: Twenty Nineteen, but only using block templates.
Requires at least: WordPress 4.9.6
Version: 0.1
License: GNU General Public License v2 or later
License URI: LICENSE
Text Domain: twentynineteen-blocks
Tags: one-column, flexible-header, accessibility-ready, custom-colors, custom-menu, custom-logo, editor-style, featured-images, footer-widgets, rtl-language-support, sticky-post, threaded-comments, translation-ready
*/

/* 
 * Import the default Twenty Nineteen styles.
 * File is almost identical to the original, except the scope of some rules 
 * has been adjusted to include the new .wp-site-blocks, .wp-block-header, 
 * and .wp-block-footer areas. Most of these changes occurred in _blocks.scss. 
*/
@import url('twentynineteen-styles/style.css');

/* Site header and footer styles */

.site-header,
.site-footer {
  margin: 0;
  padding: 1rem;
}

.wp-site-blocks .site-header > .site-branding {
	margin: 0;
}

.site-branding h1,
.site-branding .site-title {
	display: inline-block;
	color: #000;
	font-size: 1.125em;
	margin-bottom: 0;
	margin-right: 0.5em;
}

.site-branding h1:before,
.site-branding .site-title:before {
	display: none;
}

.site-branding .wp-block-column:first-child {
	flex-basis: 64px !important;
	flex-shrink: 0;
	margin-bottom: 1rem;
}

/* Social links in the header  */

.site-header .wp-block-social-links {
	margin-top: 0;
}

.site-header .wp-block-social-links > .wp-social-link {
	background-color: transparent;
	color: #111;
}

.site-header .wp-block-social-links > .wp-social-link:hover {
	color: #777;
}

.site-header .wp-block-social-links > .wp-social-link a {
	padding-left: 0;
}

.site-header .wp-block-social-links > .wp-social-link svg {
	height: 32px;
	width: 32px;
}

@media screen and (min-width: 600px) {

	/* Prevent site title & menu from shifting over unintentionally between 600-768px viewports. */
	.wp-site-blocks .site-header > * > *:last-child {
		margin-left: 0;
	}
}

@media only screen and (min-width: 768px) {
	.site-header,
	.site-footer {
		margin: 2rem calc(10% + 60px);
		padding-left: 0;
		padding-right: 0;
	}

	.site-branding .wp-block-column:not(:first-child) {
		margin-bottom: 0;
		margin-left: 1rem;
	}
}

/* Site content positioning */

.wp-site-blocks .site-content > .wp-block-group__inner-container > *:not(.align-full):not(.align-wide):not(.comments-area) {
  max-width: calc(100% - (2 * 1rem));
  margin: 0 1rem;
}

@media only screen and (min-width: 768px) {
	.wp-site-blocks .site-content > .wp-block-group__inner-container > *:not(.align-full):not(.align-wide):not(.comments-area) {
		max-width: 80%;
		margin: 0 10%;
		padding: 0 60px;
	}
}

/* Latest posts block */

.wp-block-latest-posts {
	padding-left: 0;
}

.wp-block-latest-posts li > a {
	font-size: 2.25em;
	font-weight: 700;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
	color: #111;
	line-height: 1.2;
}

.wp-block-latest-posts.wp-block-latest-posts__list li > a::before {
	background: #767676;
	content: "\020";
	display: block;
	height: 2px;
	margin: 1rem 0;
	width: 1em;
}

.wp-block-latest-posts.wp-block-latest-posts__list li:not(:first-child) {
	margin-top: calc(6 * 1rem);
}

.wp-block-latest-posts .wp-block-latest-posts__post-date {
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
	font-size: 0.71111em;
	margin-top: 0.71111em;
	margin-bottom: 1.5em;
}

@media only screen and (min-width: 768px) {
	.wp-block-latest-posts__post-excerpt {
		max-width: calc(6 * (100vw / 12) - 28px);	
	}
}

/* Site navigation styles */

.wp-block-navigation {
	font-size: 1.125em;
	font-weight: 700;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
}

.wp-block-navigation > ul > li > a {
	padding: 0 0.5rem 0 0;
	line-height: 1.6;
}

/* Large featured image headers inside of cover blocks */

.entry-content .wp-block-cover.site-featured-image {
	display: flex;
	align-items: flex-end;
	min-height: calc( 100vh - 268px );
	margin-top: 0;
}

.entry-content .wp-block-cover.site-featured-image .wp-block-cover__inner-container {
	width: 100%;
}

.entry-content .wp-block-cover.site-featured-image h2:before{
	background: white;
}