CSS: Add transitions for all links and buttons

Stay consistent across the site
diff --git a/css/style.css b/css/style.css
index 4136074..f88b1fe 100644
--- a/css/style.css
+++ b/css/style.css
@@ -59,6 +59,9 @@
   font-family: "Comfortaa", sans-serif;
   color: #ffffff; }
 
+a, .btn {
+}
+
 a:hover, a:focus, a:active {text-decoration: none;}
 
 body > .container-fluid {