Center align submit button

src/styles/clay/components/submit.scss

@@ -0,0 +1,3 @@
+.component-submit {
+  text-align: center;
+}

src/styles/clay/elements/_button.scss

@@ -9,7 +9,7 @@ button,
   font-size: 1rem;
   line-height: 1;
   border: none;
-  display: block;
+  display: inline-block;
 
   color: $color-white;
   min-width: 12rem;