Improve button styling and paragraph width.

services/web/public/stylesheets/app/editor/feature-onboarding.less

@@ -25,7 +25,7 @@
 		}
 
 		.feat-onboard-description {
-			max-width: 30em;
+			max-width: 35em;
 			margin: 0 auto 5px;
 		}
 		
@@ -66,4 +66,10 @@
 			&[disabled] {
 				opacity: 0.2;
 			}
+
+			&:focus,
+			&:active:focus {
+				outline: 0;
+				box-shadow: 0 0 70px 0 rgba(255, 255, 255, 0.3);
+			}
 		}