Fix mobile top padding

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

assets/css/image/site.css

@@ -13,6 +13,12 @@
   padding-top: 0;
 }
 
+@media (max-width: 767px) {
+  .gh-main {
+    padding-top: 0;
+  }
+}
+
 .gh-feed {
   width: 100%;
 }