attached css classes to login button

js/headfoot.js

@@ -129,6 +129,8 @@ function head(){
                 headlink.innerHTML="Account";
                 headlink.href="/account/";
             }
+            headlink.classList.add("btn");
+            headlink.classList.add("btn-outline-dark");
         }
         headitem.appendChild(headlink);
         navelements.appendChild(headitem);