Whoops

Replaces the default error handling in Craft CMS with whoops (PHP errors for cool kids). This will only occur whilst devMode is enabled for security reasons.

whoops is an error handler framework for PHP. Out-of-the-box, it provides a pretty error interface that helps you debug your web projects, but at heart it's a simple yet powerful stacked error handling system - https://github.com/filp/whoops

The plugin comes with two different themes and has the option to load your own custom theme (CSS file) via the plugin settings.