diff --git a/assets/alignments-front.css b/assets/alignments-front.css
new file mode 100644
index 0000000..15d7cf0
--- /dev/null
+++ b/assets/alignments-front.css
@@ -0,0 +1,79 @@
+/*
+ * Alignments, loaded in the front-end only.
+ */
+
+body {
+	margin: 0;
+}
+
+* {
+	box-sizing: border-box;
+}
+
+.wp-site-blocks,
+.wp-block-template-part.alignfull {
+	padding: 0 var(--wp--custom--margin--horizontal);
+}
+
+.wp-site-blocks > *:not(.wp-block-post-content),
+.wp-site-blocks .wp-block-post-content > * {
+	max-width: var(--wp--custom--width--default);
+	margin-left: auto;
+	margin-right: auto;
+}
+
+.wp-site-blocks .alignwide {
+	width: var(--wp--custom--width--wide);
+	max-width: 100%;
+	margin-left: auto;
+	margin-right: auto;
+}
+
+.wp-site-blocks .alignfull {
+	transform: translateX(calc(0px - var(--wp--custom--margin--horizontal)));
+	width: calc(100% + (2 * var(--wp--custom--margin--horizontal)));
+	max-width: calc(100% + (2 * var(--wp--custom--margin--horizontal)));
+	margin-left: 0;
+	margin-right: 0;
+	box-sizing: content-box;
+}
+
+.wp-site-blocks .wp-block-template-part.alignfull {
+	width: 100%;
+	max-width: 100%;
+}
+
+.wp-site-blocks .wp-block-columns.alignfull {
+	width: 100%;
+	max-width: 100%;
+}
+
+.aligncenter {
+	text-align: center;
+}
+
+.wp-site-blocks .alignleft {
+	float: left;
+	margin-right: 2em;
+	max-width: 360px;
+}
+
+.wp-site-blocks .alignright {
+	float: right;
+	margin-left: 2em;
+	max-width: 360px;
+}
+
+@media screen and (min-width: 1290px) {
+
+	.wp-site-blocks,
+	.wp-block-template-part.alignfull {
+		padding: 0;
+	}
+
+	.wp-site-blocks .alignfull {
+		transform: translateX(0px);
+		width: 100%;
+		max-width: 100%;
+	}
+}
diff --git a/block-template-parts/header.html b/block-template-parts/header.html
new file mode 100644
index 0000000..388c223
--- /dev/null
+++ b/block-template-parts/header.html
@@ -0,0 +1,3 @@
+<!-- wp:site-title /-->
+
+<!-- wp:site-tagline /-->
\ No newline at end of file
diff --git a/block-templates/index.html b/block-templates/index.html
new file mode 100644
index 0000000..2daeaee
--- /dev/null
+++ b/block-templates/index.html
@@ -0,0 +1,9 @@
+<!-- wp:template-part {"slug":"header","theme":"sb","tagName":"header"} /-->
+
+<!-- wp:query {"queryId":1,"query":{"offset":0,"postType":"post","categoryIds":[],"tagIds":[],"order":"desc","orderBy":"date","author":"","search":"","sticky":""}} -->
+<!-- wp:query-loop -->
+<!-- wp:post-title {"isLink":true} /-->
+
+<!-- wp:post-excerpt /-->
+<!-- /wp:query-loop -->
+<!-- /wp:query -->
\ No newline at end of file
diff --git a/block-templates/singular.html b/block-templates/singular.html
new file mode 100644
index 0000000..adb191c
--- /dev/null
+++ b/block-templates/singular.html
@@ -0,0 +1,5 @@
+<!-- wp:template-part {"slug":"header","theme":"sb","tagName":"header"} /-->
+
+<!-- wp:post-title /-->
+
+<!-- wp:post-content /-->
\ No newline at end of file
diff --git a/experimental-theme.json b/experimental-theme.json
new file mode 100644
index 0000000..95157e5
--- /dev/null
+++ b/experimental-theme.json
@@ -0,0 +1,34 @@
+{
+	"settings": {
+		"defaults": {
+			"color": {
+				"gradients": [ ],
+				"link": true,
+				"palette": [ ]
+			},
+			"spacing": {
+				"customPadding": true
+			},
+			"typography": {
+				"customLineHeight": true,
+				"fontFamilies": [ ],
+				"fontSizes": [ ]
+			},
+			"custom": {
+				"width": {
+					"default": "840px",
+					"wide": "1100px"
+				},
+				"margin": {
+					"horizontal": "14px"
+				}
+			}
+		}
+	},
+	"styles": {
+		"root": {
+			"color": { },
+			"typography": { }
+		}
+	}
+}
diff --git a/functions.php b/functions.php
new file mode 100644
index 0000000..66b9643
--- /dev/null
+++ b/functions.php
@@ -0,0 +1,41 @@
+<?php
+
+if ( ! function_exists( 'sb_support' ) ) :
+	function sb_support()  {
+
+		// Adding support for featured images.
+		add_theme_support( 'post-thumbnails' );
+
+		// Adding support for alignwide and alignfull classes in the block editor.
+		add_theme_support( 'align-wide' );
+
+		// Adding support for core block visual styles.
+		add_theme_support( 'wp-block-styles' );
+
+		// Adding support for responsive embedded content.
+		add_theme_support( 'responsive-embeds' );
+
+		// Add support for editor styles.
+		add_theme_support( 'editor-styles' );
+
+		// Enqueue editor styles.
+		add_editor_style( 'style.css' );
+
+		// Add support for custom units.
+		add_theme_support( 'custom-units' );
+	}
+	add_action( 'after_setup_theme', 'sb_support' );
+endif;
+
+/**
+ * Enqueue scripts and styles.
+ */
+function sb_scripts() {
+
+	// Enqueue theme stylesheet.
+	wp_enqueue_style( 'sb-style', get_template_directory_uri() . '/style.css', array(), wp_get_theme()->get( 'Version' ) );
+
+	// Enqueue alignments stylesheet.
+	wp_enqueue_style( 'sb-alignments-style', get_template_directory_uri() . '/assets/alignments-front.css', array(), wp_get_theme()->get( 'Version' ) );
+}
+add_action( 'wp_enqueue_scripts', 'sb_scripts' );
diff --git a/index.php b/index.php
new file mode 100644
index 0000000..e69de29
diff --git a/style.css b/style.css
new file mode 100644
index 0000000..710c53b
--- /dev/null
+++ b/style.css
@@ -0,0 +1,16 @@
+/*
+Theme Name: SB
+Theme URI: https://seriouslybonkers.com
+Author: Herb Miller
+Description: Seriously Bonker's experimental Full Site Editing theme
+Requires at least: 5.3
+Tested up to: 5.5
+Requires PHP: 5.6
+Version: 1.0
+License: GNU General Public License v2 or later
+License URI: http://www.gnu.org/licenses/gpl-2.0.html
+Text Domain: sb
+
+SB WordPress Theme, (C) 2021 WordPress.org
+SB is distributed under the terms of the GNU GPL.
+*/