Source: templates/emails/teacher-quiz-submitted.php

<?php
/**
 * Teacher quiz submitted email
 *
 * @author  Automattic
 * @package Sensei/Templates/Emails/HTML
 * @version 2.0.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
} // Exit if accessed directly ?>

<?php

// Ignore undefined variables - they are provided by the $sensei_email_data global.
// phpcs:disable VariableAnalysis.CodeAnalysis.VariableAnalysis.UndefinedVariable

// Get data for email content
global $sensei_email_data;
extract( $sensei_email_data );

// For gmail compatibility, including CSS styles in head/body are stripped out therefore styles need to be inline. These variables contain rules which are added to the template inline. !important; is a gmail hack to prevent styles being stripped if it doesn't like something.
$small = 'text-align: center !important;';

$large = 'text-align: center !important;font-size: 350% !important;line-height: 100% !important;';

?>

<?php
/**
 * Action hook before email content.
 *
 * @hook sensei_before_email_content
 *
 * @param {string} $template Template name.
 */
do_action( 'sensei_before_email_content', $template );
?>

<p style="<?php echo esc_attr( $small ); ?>"><?php esc_html_e( 'Your student', 'sensei-lms' ); ?></p>

<h2 style="<?php echo esc_attr( $large ); ?>"><?php echo esc_html( $learner_name ); ?></h2>

<p style="<?php echo esc_attr( $small ); ?>"><?php esc_html_e( 'has submitted the quiz for lesson', 'sensei-lms' ); ?></p>

<h2 style="<?php echo esc_attr( $large ); ?>"><?php echo esc_html( get_the_title( $lesson_id ) ); ?></h2>

<p style="<?php echo esc_attr( $small ); ?>"><?php esc_html_e( 'for grading.', 'sensei-lms' ); ?></p>

<hr/>

<p style="<?php echo esc_attr( $small ); ?>">
<?php
printf(
	// translators: Placeholders are an opening and closing <a> tag linking to the grading page for the quiz.
	esc_html__( 'You can grade this quiz %1$shere%2$s.', 'sensei-lms' ),
	'<a href="' .
	esc_url( admin_url( 'admin.php?page=sensei_grading&user=' . $learner_id . '&quiz_id=' . $quiz_id ) ) .
	'">',
	'</a>'
);
?>
</p>

<?php
/**
 * Action hook after email content.
 *
 * @hook sensei_after_email_content
 *
 * @param {string} $template Template name.
 */
do_action( 'sensei_after_email_content', $template );
?>