<?php yii\widgets\Pjax::end() ?>
```

**Simple Bootstrap themes**
---
There is this page [bootswatch.com](https://bootswatch.com) which provides simple bootstrap themes. It is enough just to replace one CSS file - you can do it in file "views/layouts/main.php" just by adding following row just before < /head > tag: ```html <link href="https://bootswatch.com/3/readable/bootstrap.min.css" rel="stylesheet">  
 
</head>
``` Note that currently Yii2 is using Bootstrap3 so when searching for themes, dont forget to switch to section "[Bootstrap 3"](https://bootswatch.com/3/).