diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab05e7c1..2ae00f14 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+# [1.1.0-alpha.1](https://github.com/Automattic/newspack-block-theme/compare/v1.0.0...v1.1.0-alpha.1) (2023-05-11)
+
+
+### Features
+
+* add mobile menu part proof of concept ([#3](https://github.com/Automattic/newspack-block-theme/issues/3)) ([3768123](https://github.com/Automattic/newspack-block-theme/commit/3768123019a5400509d145b033300934b901f55f))
+
 # 1.0.0 (2023-05-03)
 
 
diff --git a/functions.php b/functions.php
index cdff6559..40d4ac29 100644
--- a/functions.php
+++ b/functions.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * Newspack Block Theme functions and definitions
- * Version: 1.0.0
+ * Version: 1.1.0-alpha.1
  *
  * @link https://developer.wordpress.org/themes/basics/theme-functions/
  *
@@ -16,7 +16,7 @@
 	define( 'NEWSPACK_BLOCK_THEME_FILE', __FILE__ );
 	define( 'NEWSPACK_BLOCK_THEME_FILE_PATH', plugin_dir_path( NEWSPACK_BLOCK_THEME_FILE ) );
 	define( 'NEWSPACK_BLOCK_THEME_URL', plugin_dir_url( NEWSPACK_BLOCK_THEME_FILE ) );
-	define( 'NEWSPACK_BLOCK_THEME_VERSION', '1.0.0' );
+	define( 'NEWSPACK_BLOCK_THEME_VERSION', '1.1.0-alpha.1' );
 }
 
 
diff --git a/package-lock.json b/package-lock.json
index 2a3b832e..5038a814 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "newspack-block-theme",
-  "version": "1.0.0",
+  "version": "1.1.0-alpha.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "newspack-block-theme",
-      "version": "1.0.0",
+      "version": "1.1.0-alpha.1",
       "hasInstallScript": true,
       "license": "GPL-3.0",
       "devDependencies": {
diff --git a/package.json b/package.json
index 1096da8a..bd33b679 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "newspack-block-theme",
-  "version": "1.0.0",
+  "version": "1.1.0-alpha.1",
   "description": "A forward-looking news theme designed and developed to be highly customizable with the WordPress block editor. Brought to you by Newspack: https://newspack.com",
   "repository": {
     "type": "git",
diff --git a/src/scss/_theme-description.scss b/src/scss/_theme-description.scss
index 529a6870..4bad43b5 100644
--- a/src/scss/_theme-description.scss
+++ b/src/scss/_theme-description.scss
@@ -7,7 +7,7 @@ Description: A forward-looking news theme designed and developed to be highly cu
 Requires at least: 5.8
 Tested up to: 5.9
 Requires PHP: 5.7
-Version: 1.0.0
+Version: 1.1.0-alpha.1
 License: GNU General Public License v2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 Template:
diff --git a/style.css b/style.css
new file mode 100644
index 00000000..93928657
--- /dev/null
+++ b/style.css
@@ -0,0 +1,16 @@
+/*!
+Theme Name: Newspack Block Theme
+Theme URI: https://github.com/automattic/newspack-block-theme
+Author: Automattic
+Author URI: https://newspack.com
+Description: A forward-looking news theme designed and developed to be highly customizable with the WordPress block editor. Brought to you by Newspack: https://newspack.com
+Requires at least: 5.8
+Tested up to: 5.9
+Requires PHP: 5.7
+Version: 1.1.0-alpha.1
+License: GNU General Public License v2 or later
+License URI: http://www.gnu.org/licenses/gpl-2.0.html
+Template:
+Text Domain: newspack-block-theme
+Tags: one-column, wide-blocks, block-patterns, custom-colors, custom-logo, custom-menu, editor-style, featured-images, full-site-editing, rtl-language-support, theme-options, threaded-comments, translation-ready, one-column, custom-colors, custom-menu, custom-logo, editor-style, featured-images, full-site-editing, block-patterns, rtl-language-support, theme-options, threaded-comments, translation-ready, wide-blocks, auto-loading-homepage
+*/.wp-block-button.is-style-outline>.wp-block-button__link:not(.has-background):hover{background-color:var(--wp--preset--color--secondary);color:var(--wp--preset--color--base);border-color:var(--wp--preset--color--secondary)}a{text-decoration-thickness:.0625em!important;text-underline-offset:.15em}html{box-sizing:border-box}*,:after,:before{box-sizing:inherit}.desktop-header{display:none}@media only screen and (min-width:992px){.desktop-header{display:inherit}.mobile-header{display:none}}.mobile-sidebar{background:var(--wp--custom--background--mobile-menu);inset:0 -100% 0 auto;overflow:auto;padding:2rem;position:fixed;transition:right .2s;width:90%;z-index:999999}@media only screen and (min-width:782px){.mobile-sidebar{width:50%}}.mobile-sidebar>*{visibility:hidden}.overlay-mask{background:var(--wp--custom--background--mobile-menu-overlay);content:"";display:none;inset:0;position:fixed;z-index:2000}.menu-open--mobile-menu .mobile-sidebar{right:0}.menu-open--mobile-menu .mobile-sidebar>*{visibility:visible}.menu-open--mobile-menu .overlay-mask{display:block}
\ No newline at end of file