chore(storybook): center align stories

Author: youda97

.storybook/manager-head.html

@@ -9,6 +9,12 @@
 <meta name="twitter:card" content="summary_large_image">
 
 <style id="iframestyle">
+.sb-show-main {
+	padding: 3em;
+	display: flex;
+	flex-direction: column;
+	align-items: center;
+}
 .experimental .toggle-btn,
 .toggle-btn {
 	padding: 9px;