Display block for .btn class

ckanext/odsh/assets/odsh.css

@@ -1261,6 +1261,7 @@ select, textarea, input[type="text"], input[type="password"], input[type="dateti
 }
 
 .btn {
+  display: block;
   border-bottom-color: none;
   -webkit-box-shadow: none;
   -moz-box-shadow: none;