How to add an options page (checkbox)?

Good afternoon everyone! Guys, tell me how to save the option, namely the checkbox, simple text fields work, but the checkbox is not written, the value is always empty:

// Add the option page to the WordPress admin menu {echo:get_option('my_option_fb')}
function my_plugin_options() {
  add_options_page(
	'Site Variables', // Page title
	'Variables', // Menu title
	'manage_options', // Capability required to access the page
	'my-plugin', // Menu slug
	'my_plugin_options_page' // Callback function to display the options page
  );
}
add_action('admin_menu', 'my_plugin_options');

// Display the options page
function my_plugin_options_page() {
  ?>
  <div class="wrap">
	<h2>Site Variables</h2>
	<form method="post" action="options.php">
	  <?php settings_fields('my_plugin_options'); ?>
	  <?php do_settings_sections('my_plugin_options'); ?>

?>

	  <table class="form-table">
		<tr valign="top">
		  <th scope="row">facebook</th>
		  <td><input type="text" name="my_option_fb" value="<?php echo esc_attr(get_option('my_option_fb')); ?>" /></td>
		</tr>
		<tr valign="top">
		  <th scope="row">Linked IN</th>
		  <td><input type="text" name="my_option_insta" value="<?php echo esc_attr(get_option('my_option_insta')); ?>" /></td>
		</tr>

 <tr valign="top">
		  <th scope="row">Maintenance mode</th>
		  <td><input type="checkbox" name="my_option_maintenance" value="<?php echo esc_attr(get_option('my_option_maintenance')); ?>" /></td>
		</tr>

	  </table>

	  <?php submit_button(); ?>
	</form>
  </div>
  <?php
}

// Register the settings
function my_plugin_register_settings() {
  register_setting('my_plugin_options', 'my_option_fb');
  register_setting('my_plugin_options', 'my_option_insta');
  register_setting('my_plugin_options', 'my_option_maintenance');
}
add_action('admin_init', 'my_plugin_register_settings');

input type=”checkbox” name=”my_option_maintenance – in this place problem

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