Add spacing between title and nav on mobile

Author: thomas0829

_sass/layout/_masthead.scss

@@ -70,7 +70,9 @@
     margin: 0 auto;
 
     @media (max-width: 600px) {
-      gap: 1em;
+      gap: 0.8em;
+      margin-left: 0.6em;
+      margin-right: 0.6em;
     }
 
     a {