upd

_includes/head.html

@@ -7,7 +7,7 @@
 
   <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/the-grid-flexbox@2.0.1/css/the-grid.min.css">
   <link href="https://cdn.rawgit.com/michalsnik/aos/2.1.1/dist/aos.css" rel="stylesheet">
-  <link rel="stylesheet" href="{{ include.assetpath }}css/main.css">
+  <link rel="stylesheet" href="{{ include.assetpath }}css/main.css?1">
 
   <link rel="shortcut icon" href="{{ include.assetpath }}assets/img/favicon.png">
   <link rel="icon" href="{{ include.assetpath }}assets/img/favicon.png">