Make "Get Started" button a bit shorter

Author: evancz

assets/style.css

@@ -173,7 +173,7 @@ a:hover {
 
 .get-started-button {
   background-color: #34495E;
-  padding: 20px 40px;
+  padding: 12px 40px;
   border-radius: 20px;
   margin: 18px;
   display: inline-block;