add constrained style for list items

functions.php

@@ -39,4 +39,14 @@ function lex_scotland_block_styles() {
             }
         '
     ) );
+
+    register_block_style( 'core/list-item', array(
+		'name'         => 'constrained',
+		'label'        => __( 'Constrained', 'lex-scotland' ),
+        'inline_style' => '
+            li.is-style-constrained {
+                max-width: 50ch;
+            }
+        '
+    ) );
 }