Add smaller header fonts for mobile

_sass/main.scss

@@ -166,6 +166,13 @@ blockquote {
 }
 
 @media screen and (max-width: 600px){
+  h1 {
+    font-size: 40px; 
+  }
+  h2 {
+    font-size: 32px;
+  }
+
   #menu,
   label[for="menu"]{
     display: inline-block;