font sizing

index.html

@@ -70,9 +70,9 @@
     <div class="hero-body">
       <div class="container">
         <div class="column is-6 is-offset-1">
-          <p class="is-size-1 is-size-3-tablet has-text-primary">
+          <p class="is-size-1 is-size-3-touch has-text-primary">
             <span class="has-text-white has-text-weight-bold">Accessibility</span> isn't that hard.</p>
-          <p class="is-size-4 is-size-6 tablet has-text-primary">It's time to build applications everyone can use. It's time for
+          <p class="is-size-4 is-size-6-touch has-text-primary">It's time to build applications everyone can use. It's time for
             applications to be <span class="has-text-white has-text-weight-bold">'born accessible'</span> instead
             of having accessibility added as an afterthought.
           </p>