Updated versions and small improvements

package.json

@@ -1,10 +1,10 @@
 {
   "name": "gatsby-theme-catalyst-onepage",
-  "description": "Extends the base catalyst core theme to create a one page Gatsby theme",
-  "version": "0.1.18",
+  "description": "Gatsby Theme - Child theme for the base catalyst core theme to create a one page site.",
+  "version": "0.2.0",
   "author": "Eric Howey <[email protected]>",
   "dependencies": {
-    "gatsby-theme-catalyst-core": "^0.1.15",
+    "gatsby-theme-catalyst-core": "^0.2.0",
     "react-scroll": "^1.7.12"
   },
   "devDependencies": {

src/gatsby-theme-catalyst-core/components/branding.js

@@ -67,7 +67,7 @@ const siteBranding = props => {
       />
       <h1
         sx={{
-          fontSize: [4, 5, 6],
+          fontSize: [3, 5, 6],
           flex: "0 0 auto"
         }}
       >

src/gatsby-theme-catalyst-core/components/nav.js

@@ -6,7 +6,11 @@ import { SocialHeaderIcons, SocialLinks } from "gatsby-theme-catalyst-core";
 const siteNav = props => {
   const { theme } = useThemeUI();
   const headOpen = () => {
-    return window.innerHeight - parseInt(theme.sizes.headerHeight) + "px";
+    if (typeof window !== "undefined") {
+      return window.innerHeight - parseInt(theme.sizes.headerHeight) + "px";
+    } else {
+      return null;
+    }
   }; //Used to calculate the height of the nav so it is exactly the height of the window
   return (
     <nav