diff --git a/src/my-calendar-styles.php b/src/my-calendar-styles.php
index 8b0345364..190e50955 100644
--- a/src/my-calendar-styles.php
+++ b/src/my-calendar-styles.php
@@ -13,210 +13,56 @@
 	exit;
 }
 
-/**
- * Migrate CSS file to custom.
- */
-function mc_migrate_css() {
-	if ( isset( $_GET['migrate'] ) ) {
-		if ( 'false' === $_GET['migrate'] ) {
-			mc_update_option( 'migrated', 'true' );
-			mc_show_notice( __( 'Thank you! Your site will be updated to the latest version of core CSS at every update.', 'my-calendar' ) );
-		} else {
-			$verify = wp_verify_nonce( $_GET['migrate'], 'mc-migrate-css' );
-			if ( ! $verify ) {
-				wp_die( 'My Calendar: Permissions not granted to migrate CSS.', 'my-calendar' );
-			} else {
-				global $wp_filesystem;
-				WP_Filesystem();
-				$style       = mc_get_option( 'css_file' );
-				$stylefile   = mc_get_style_path();
-				$newfileroot = str_replace( '/my-calendar/', '/my-calendar-custom/', plugin_dir_path( __FILE__ ) );
-				$newfiledir  = trailingslashit( $newfileroot ) . 'styles/';
-				$newfilepath = trailingslashit( $newfiledir ) . $style;
-				if ( ! $wp_filesystem->exists( $newfileroot ) ) {
-					$wp_filesystem->mkdir( $newfileroot );
-				}
-				if ( ! $wp_filesystem->exists( $newfiledir ) ) {
-					$wp_filesystem->mkdir( $newfiledir );
-				}
-				$wrote_migration = $wp_filesystem->copy( $stylefile, $newfilepath, true );
-				if ( $wrote_migration ) {
-					$new = 'mc_custom_' . $style;
-					mc_update_option( 'css_file', $new );
-					mc_update_option( 'migrated', 'true' );
-					mc_show_notice( __( 'CSS migrated to custom directory.', 'my-calendar' ) );
-				} else {
-					mc_show_error( __( 'CSS migration failed. You may need to migrate your file via FTP.', 'my-calendar' ) );
-				}
-			}
-		}
-	}
-}
-
-
-/**
- * Re-migrate CSS file to custom location from invalid location.
- */
-function mc_remigrate_css() {
-	if ( isset( $_GET['remigrate'] ) ) {
-		if ( 'false' === $_GET['remigrate'] ) {
-			mc_update_option( 'remigrated', 'true' );
-			mc_show_notice( __( 'All right! Leaving your CSS file where it is.', 'my-calendar' ) );
-		} else {
-			$verify = wp_verify_nonce( $_GET['remigrate'], 'mc-remigrate-css' );
-			if ( ! $verify ) {
-				wp_die( 'My Calendar: Permissions not granted to migrate CSS.', 'my-calendar' );
-			} else {
-				global $wp_filesystem;
-				WP_Filesystem();
-				$path  = str_replace( '/my-calendar', '', plugin_dir_path( __DIR__ ) ) . 'styles/';
-				$files = mc_css_list( $path );
-				if ( ! empty( $files ) ) {
-					$style = $files[0];
-				}
-				$stylefile   = trailingslashit( $path ) . $style;
-				$newfileroot = str_replace( '/my-calendar/', '/my-calendar-custom/', plugin_dir_path( __FILE__ ) );
-				$newfiledir  = trailingslashit( $newfileroot ) . 'styles/';
-				$newfilepath = trailingslashit( $newfiledir ) . $style;
-				if ( ! $wp_filesystem->exists( $newfileroot ) ) {
-					$wp_filesystem->mkdir( $newfileroot );
-				}
-				if ( ! $wp_filesystem->exists( $newfiledir ) ) {
-					$wp_filesystem->mkdir( $newfiledir );
-				}
-				$wrote_migration = $wp_filesystem->copy( $stylefile, $newfilepath, true );
-				if ( $wrote_migration ) {
-					$new = 'mc_custom_' . $style;
-					mc_update_option( 'css_file', $new );
-					mc_update_option( 'remigrated', 'true' );
-					mc_show_notice( __( 'CSS migrated to the proper custom directory.', 'my-calendar' ) );
-				} else {
-					mc_show_error( __( 'CSS migration failed. You may need to migrate your file via FTP.', 'my-calendar' ) );
-				}
-			}
-		}
-	}
-}
-
-/**
- * Show CSS migration notice.
- */
-function mc_migrate_notice() {
-	if ( ! ( 'true' === mc_get_option( 'migrated' ) ) && current_user_can( 'mc_edit_styles' ) ) {
-		if ( ! mc_is_custom_style( mc_get_option( 'css_file' ) ) ) {
-			$nonce       = wp_create_nonce( 'mc-migrate-css' );
-			$migrate_url = add_query_arg( 'migrate', $nonce, admin_url( 'admin.php?page=my-calendar-design' ) );
-			$dismiss_url = add_query_arg( 'migrate', 'false', admin_url( 'admin.php?page=my-calendar-design' ) );
-			// Translators: 1) URL for link to migrate styles. 2) URL to dismiss message and use existing styles. 3) Help link.
-			mc_show_notice( sprintf( __( 'The CSS Style editor will be removed in My Calendar 3.5. Migrate custom CSS into the My Calendar custom directory at <code>/wp-content/plugins/my-calendar-custom/</code>. <a href="%1$s" class="button-secondary">Migrate CSS now</a> <a href="%2$s" class="button-primary">Keep My Calendar\'s styles</a> %3$s', 'my-calendar' ), $migrate_url, $dismiss_url, mc_help_link( __( 'Learn more', 'my-calendar' ), __( 'Migrating to Custom CSS', 'my-calendar' ), 'Custom CSS', 7, false ) ) );
-		} else {
-			mc_show_notice( __( 'The CSS Style editor will be removed in My Calendar 3.5. You are already using custom CSS, and no changes are required.', 'my-calendar' ) );
-		}
-	}
-}
-
-/**
- * Show CSS migration apology.
- *
- * @return void
- */
-function mc_remigrate_notice() {
-	if ( ! ( 'true' === mc_get_option( 'remigrated' ) ) ) {
-		$path  = str_replace( '/my-calendar', '', plugin_dir_path( __FILE__ ) ) . 'styles/';
-		$files = mc_css_list( $path );
-		if ( ! empty( $files ) ) {
-			$migrations  = implode( ',', $files );
-			$nonce       = wp_create_nonce( 'mc-remigrate-css' );
-			$migrate_url = add_query_arg( 'remigrate', $nonce, admin_url( 'admin.php?page=my-calendar-design' ) );
-			$dismiss_url = add_query_arg( 'remigrate', 'false', admin_url( 'admin.php?page=my-calendar-design' ) );
-			// Translators: 1) URL for link to remigrate styles. 2) URL to dismiss message. 3) Help link.
-			mc_show_notice( sprintf( __( 'Your previously migrated CSS file (<code>%1$s</code>) got put in the wrong directory. <a href="%2$s" class="button-secondary">Move it to the right place?</a> <a href="%3$s" class="button-primary">No, thanks.</a>', 'my-calendar' ), $migrations, $migrate_url, $dismiss_url ) );
-		}
-	}
-}
-
 /**
  * Generate stylesheet editor
  */
 function my_calendar_style_edit() {
-	$edit_files = true;
 	$message    = '';
 	if ( ! current_user_can( 'mc_edit_styles' ) ) {
 		echo wp_kses_post( '<p>' . __( 'You do not have permission to customize styles on this site.', 'my-calendar' ) . '</p>' );
+
 		return;
 	}
-	if ( defined( 'DISALLOW_FILE_EDIT' ) && DISALLOW_FILE_EDIT === true ) {
-		$edit_files = false;
-		mc_show_error( __( 'File editing is disallowed in your WordPress installation. Edit your stylesheets offline.', 'my-calendar' ) );
-	}
-	mc_migrate_css();
-	mc_migrate_notice();
-	mc_remigrate_css();
-	mc_remigrate_notice();
-	if ( isset( $_POST['mc_edit_style'] ) || isset( $_POST['mc_reset_style'] ) ) {
+
+	if ( isset( $_POST['mc_edit_style'] ) ) {
 		$nonce = $_REQUEST['_wpnonce'];
 		if ( ! wp_verify_nonce( $nonce, 'my-calendar-nonce' ) ) {
 			wp_die( 'My Calendar: Security check failed' );
 		}
-		if ( isset( $_POST['mc_reset_style'] ) ) {
-			if ( ! empty( $_POST['reset_styles'] ) ) {
-				$stylefile        = mc_get_style_path();
-				$styles           = mc_default_style();
-				$wrote_old_styles = mc_write_styles( $stylefile, $styles );
-				if ( $wrote_old_styles ) {
-					$message = '<p>' . __( 'Stylesheet updated to match core version.', 'my-calendar' ) . '</p>';
-				}
-			}
-		} else {
-			$my_calendar_style = ( isset( $_POST['style'] ) ) ? stripcslashes( $_POST['style'] ) : false;
-			$mc_css_file       = stripcslashes( sanitize_file_name( $_POST['mc_css_file'] ) );
-
-			if ( $edit_files ) {
-				$stylefile    = mc_get_style_path( $mc_css_file );
-				$wrote_styles = ( false !== $my_calendar_style ) ? mc_write_styles( $stylefile, $my_calendar_style ) : 'disabled';
-			} else {
-				$wrote_styles = false;
-			}
+	
+		$mc_show_css = ( empty( $_POST['mc_show_css'] ) ) ? '' : stripcslashes( sanitize_text_field( $_POST['mc_show_css'] ) );
+		mc_update_option( 'show_css', $mc_show_css );
+		$use_styles = ( empty( $_POST['use_styles'] ) ) ? '' : 'true';
+		mc_update_option( 'use_styles', $use_styles );
 
-			if ( 'disabled' === $wrote_styles ) {
-				$message = '<p>' . __( 'Styles are disabled, and were not edited.', 'my-calendar' ) . '</p>';
-			} else {
-				$message = ( true === $wrote_styles ) ? '<p>' . __( 'The stylesheet has been updated.', 'my-calendar' ) . ' <a href="' . add_query_arg( 'migrate', $nonce, admin_url( 'admin.php?page=my-calendar-design' ) ) . '">' . __( 'Migrate your CSS to the Custom CSS Directory', 'my-calendar' ) . '</a></p>' : '<p><strong>' . __( 'Write Error! Please verify write permissions on the style file.', 'my-calendar' ) . '</strong></p>';
-			}
-
-			$mc_show_css = ( empty( $_POST['mc_show_css'] ) ) ? '' : stripcslashes( sanitize_text_field( $_POST['mc_show_css'] ) );
-			mc_update_option( 'show_css', $mc_show_css );
-			$use_styles = ( empty( $_POST['use_styles'] ) ) ? '' : 'true';
-			mc_update_option( 'use_styles', $use_styles );
-
-			if ( ! empty( $_POST['style_vars'] ) ) {
-				$styles = mc_get_option( 'style_vars' );
-				if ( isset( $_POST['new_style_var'] ) ) {
-					$key = sanitize_text_field( $_POST['new_style_var']['key'] );
-					$val = sanitize_text_field( $_POST['new_style_var']['val'] );
-					if ( $key && $val ) {
-						if ( 0 !== strpos( $key, '--' ) ) {
-							$key = '--' . $key;
-						}
-						$styles[ $key ] = $val;
+		if ( ! empty( $_POST['style_vars'] ) ) {
+			$styles = mc_get_option( 'style_vars' );
+			if ( isset( $_POST['new_style_var'] ) ) {
+				$key = sanitize_text_field( $_POST['new_style_var']['key'] );
+				$val = sanitize_text_field( $_POST['new_style_var']['val'] );
+				if ( $key && $val ) {
+					if ( 0 !== strpos( $key, '--' ) ) {
+						$key = '--' . $key;
 					}
+					$styles[ $key ] = $val;
 				}
-				foreach ( $_POST['style_vars'] as $key => $value ) {
-					if ( '' !== trim( $value ) ) {
-						$styles[ $key ] = sanitize_text_field( $value );
-					}
+			}
+			foreach ( $_POST['style_vars'] as $key => $value ) {
+				if ( '' !== trim( $value ) ) {
+					$styles[ $key ] = sanitize_text_field( $value );
 				}
-				if ( isset( $_POST['delete_var'] ) ) {
-					$delete = sanitize_text_field( $_POST['delete_var'] );
-					foreach ( $delete as $del ) {
-						unset( $styles[ $del ] );
-					}
+			}
+			if ( isset( $_POST['delete_var'] ) ) {
+				$delete = sanitize_text_field( $_POST['delete_var'] );
+				foreach ( $delete as $del ) {
+					unset( $styles[ $del ] );
 				}
-				mc_update_option( 'style_vars', $styles );
 			}
-
-			$message .= ' ' . __( 'Style Settings Saved', 'my-calendar' ) . '.';
+			mc_update_option( 'style_vars', $styles );
 		}
+
+		$message .= ' ' . __( 'Style Settings Saved', 'my-calendar' ) . '.';
+
 		mc_show_notice( $message );
 	}
 	if ( isset( $_POST['mc_choose_style'] ) ) {
@@ -238,52 +84,13 @@ function my_calendar_style_edit() {
 		WP_Filesystem();
 		$file              = $wp_filesystem->get_contents( $stylefile );
 		$my_calendar_style = $file;
-		$mc_current_style  = mc_default_style();
 	} else {
-		$mc_current_style  = '';
 		$my_calendar_style = __( 'Sorry. The file you are looking for doesn\'t appear to exist. Please check your file name and location!', 'my-calendar' );
 	}
-	$left_string  = normalize_whitespace( $my_calendar_style );
-	$right_string = normalize_whitespace( $mc_current_style );
-	if ( $right_string ) { // If right string is blank, there is no default.
-		if ( isset( $_GET['diff'] ) ) {
-			?>
-			<div id="diff">
-			<div class="reset-styles notice">
-				<div class="faux-p">
-					<form method="post" action="<?php echo esc_url( admin_url( 'admin.php?page=my-calendar-design' ) ); ?>" class="inline-form">
-						<input type="hidden" name="_wpnonce" value="<?php echo wp_create_nonce( 'my-calendar-nonce' ); ?>"/>
-						<input type="hidden" value="true" name="mc_reset_style"/>
-						<input type="hidden" name="mc_css_file" value="<?php echo esc_attr( mc_get_option( 'css_file' ) ); ?>"/>
-						<input type="checkbox" id="reset_styles" name="reset_styles" <?php echo esc_attr( ( mc_is_custom_style( mc_get_option( 'css_file' ) ) ) ? 'disabled' : '' ); ?> /> <label for="reset_styles"><?php esc_html_e( 'Reset stylesheet to match core version', 'my-calendar' ); ?></label>
-						<input type="submit" name="save" class="button-primary button-adjust" value="<?php esc_attr_e( 'Reset Styles', 'my-calendar' ); ?>" />
-					</form>
-					<a class="button-secondary" href="<?php echo esc_url( admin_url( 'admin.php?page=my-calendar-design' ) ); ?>"><?php esc_html_e( 'Return to editing', 'my-calendar' ); ?></a>
-				</div>
-			</div>
-			<?php
-			$diff = wp_text_diff(
-				$left_string,
-				$right_string,
-				array(
-					'title'       => __( 'Comparing Your Style with latest installed version of My Calendar', 'my-calendar' ),
-					'title_right' => __( 'Latest (from plugin)', 'my-calendar' ),
-					'title_left'  => __( 'Current (in use)', 'my-calendar' ),
-				)
-			);
-			echo wp_kses_post( $diff );
-			?>
-			</div>
-			<?php
-		}
-		if ( trim( $left_string ) !== trim( $right_string ) && ! isset( $_GET['diff'] ) ) {
-			mc_show_error( __( 'There have been updates to the stylesheet.', 'my-calendar' ) . ' <a href="' . esc_url( admin_url( 'admin.php?page=my-calendar-design&diff' ) ) . '">' . __( 'Compare Your Stylesheet with latest installed version of My Calendar.', 'my-calendar' ) . '</a>' );
-		}
-	}
+
 	echo mc_stylesheet_selector();
-	if ( ! isset( $_GET['diff'] ) ) {
-		$file = mc_get_option( 'css_file' );
-		?>
+	$file = mc_get_option( 'css_file' );
+	?>
 	<form method="post" action="<?php echo esc_url( admin_url( 'admin.php?page=my-calendar-design' ) ); ?>">
 		<input type="hidden" name="_wpnonce" value="<?php echo wp_create_nonce( 'my-calendar-nonce' ); ?>" />
 		<input type="hidden" value="true" name="mc_edit_style" />
@@ -325,49 +132,8 @@ function my_calendar_style_edit() {
 				<input type='text' class="mc-color-input" name='new_style_var[val]' id='new_style_var_val' />
 			</p>
 		</fieldset>
-		<fieldset style="position:relative;">
-			<legend><?php esc_html_e( 'CSS Style Editor', 'my-calendar' ); ?></legend>
-			<?php
-			if ( mc_is_custom_style( mc_get_option( 'css_file' ) ) ) {
-				$path    = mc_get_style_path( mc_get_option( 'css_file' ) );
-				$paths   = explode( 'wp-content', $path );
-				$remnant = $paths[1];
-				$built   = '';
-				if ( false !== stripos( $remnant, '/plugins/' ) ) {
-					$link   = admin_url( 'plugin-editor.php' );
-					$target = str_replace( '/plugins/', '', $remnant );
-					$built  = add_query_arg( 'file', $target, $link );
-				} elseif ( ! wp_is_block_theme() ) {
-					$link   = admin_url( 'theme-editor.php' );
-					$target = str_replace( '/themes/', '', $remnant );
-					$built  = add_query_arg( 'file', $target, $link );
-				}
-				if ( $built ) {
-					echo wp_kses_post( '<div class="style-editor-notice"><p class="mc-editor-not-available"><a href="' . esc_url( $built ) . '">' . __( 'Edit your custom CSS using the WordPress file editor.', 'my-calendar' ) . '</a></p></div>' );
-				} else {
-					echo wp_kses_post( '<div class="style-editor-notice"><p class="mc-editor-not-available">' . __( 'The editor is not available for custom CSS files. Edit your custom CSS locally, then upload your changes.', 'my-calendar' ) . '</p></div>' );
-				}
-			} else {
-				$nonce       = wp_create_nonce( 'mc-migrate-css' );
-				$migrate_url = '<a href="' . add_query_arg( 'migrate', $nonce, admin_url( 'admin.php?page=my-calendar-design' ) ) . '" class="button-secondary">' . __( 'Migrate to custom CSS', 'my-calendar' ) . '</a>';
-				$disabled    = ( $edit_files || mc_get_option( 'use_styles' ) === 'true' ) ? '' : ' disabled="disabled"';
-				?>
-				<p class="mc-label-with-button"><label for="style">
-				<?php
-				// Translators: file name being edited.
-				echo sprintf( esc_html__( 'Edit %s', 'my-calendar' ), '<code>' . $file . '</code>' );
-				?>
-				</label><?php echo $migrate_url; ?></p><textarea <?php echo esc_attr( $disabled ); ?> class="style-editor" id="style" name="style" rows="30" cols="80"><?php echo esc_textarea( $my_calendar_style ); ?></textarea>
-				<?php
-			}
-			?>
-			<p>
-				<input type="submit" name="save" class="button-primary button-adjust" value="<?php esc_attr_e( 'Save Changes', 'my-calendar' ); ?>" />
-			</p>
-		</fieldset>
 	</form>
-		<?php
-	}
+	<?php
 }
 
 /**
@@ -518,39 +284,6 @@ function mc_get_style_path( $filename = false, $type = 'path' ) {
 	}
 }
 
-/**
- * Fetch the styles for the current selected style
- *
- * @param string|false $filename File name or false to return defined default stylesheet.
- * @param string       $return content, filename, or both.
- *
- * @return string|array File name, file content, or array with both.
- */
-function mc_default_style( $filename = false, $return = 'content' ) {
-	if ( ! $filename ) {
-		$mc_css_file = mc_get_option( 'css_file', '' );
-	} else {
-		$mc_css_file = trim( $filename );
-	}
-	$mc_current_file = dirname( __FILE__ ) . '/templates/' . $mc_css_file;
-	global $wp_filesystem;
-	WP_Filesystem();
-	if ( $mc_css_file && $wp_filesystem->exists( $mc_current_file ) ) {
-		$file             = $wp_filesystem->get_contents( $mc_current_file );
-		$mc_current_style = $file;
-		switch ( $return ) {
-			case 'content':
-				return $mc_current_style;
-			case 'path':
-				return $mc_current_file;
-			case 'both':
-				return array( $mc_current_file, $mc_current_style );
-		}
-	}
-
-	return '';
-}
-
 /**
  * List CSS files in a directory
  *
@@ -577,76 +310,6 @@ function mc_css_list( $directory ) {
 	return $results;
 }
 
-/**
- * Write updated styles to file
- *
- * @param string $file File to write to.
- * @param string $style New styles to write.
- *
- * @return boolean;
- */
-function mc_write_styles( $file, $style ) {
-	if ( defined( 'DISALLOW_FILE_EDIT' ) && DISALLOW_FILE_EDIT === true ) {
-		return false;
-	}
-
-	$standard        = dirname( __FILE__ ) . '/styles/';
-	$files           = mc_css_list( $standard );
-	$accepted_styles = array();
-	foreach ( $files as $f ) {
-		$filepath = mc_get_style_path( $f );
-		$path     = pathinfo( $filepath );
-		if ( 'css' === $path['extension'] ) {
-			$accepted_styles[] = $filepath;
-		}
-	}
-
-	if ( in_array( $file, $accepted_styles, true ) ) {
-		$is_writable = wp_is_writable( $file );
-		if ( $is_writable ) {
-			global $wp_filesystem;
-			WP_Filesystem();
-			$saved = $wp_filesystem->put_contents( $file, $style );
-
-			return $saved;
-		} else {
-			return false;
-		}
-	}
-
-	return false;
-}
-
-add_action(
-	'admin_enqueue_scripts',
-	function() {
-		if ( ! function_exists( 'wp_enqueue_code_editor' ) ) {
-			return;
-		}
-
-		if ( sanitize_title( __( 'My Calendar', 'my-calendar' ) ) . '_page_my-calendar-design' !== get_current_screen()->id ) {
-			return;
-		}
-
-		// Enqueue code editor and settings for manipulating HTML.
-		$settings = wp_enqueue_code_editor( array( 'type' => 'text/css' ) );
-
-		// Bail if user disabled CodeMirror.
-		if ( false === $settings ) {
-			return;
-		}
-
-		wp_add_inline_script(
-			'code-editor',
-			sprintf(
-				'jQuery( function() { wp.codeEditor.initialize( "style", %s ); } );',
-				wp_json_encode( $settings )
-			)
-		);
-	}
-);
-
-
 /**
  * Measure the relative luminosity between two RGB values.
  *