fix postModal body styling

scripts/modal/post.js

@@ -3,6 +3,6 @@ const transit = require("./transit");
 module.exports = (id) => {
     document.getElementById('modal-block').remove();
     window.kade.modal = false;
-    document.body.style.overflow = 'auto';
+    document.body.style.overflowY = 'overlay';
     transit(id, false);
 };