Wrong function used to enqueue style

In your functions.php file you used function blogotron_scripts_styles() to import style.css file. You used function get_template_directory_uri, but you should have used get_stylesheet_directory_uri.

In the event that a child theme is being used, the parent theme directory URI will be returned. get_template_directory_uri() should be used for resources that are not intended to be included in/over-ridden by a child theme. Use get_stylesheet_directory_uri() to include resources that are intended to be included in/over-ridden by the child theme.