sidebar_class_name dont provided

[splincode]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Description

I add sidebar_class_name

---
id: page is hidded
title: 'Hidden page'
hide_title: true
sidebar_label: 'Hidden page 🔐'
sidebar_position: 1
sidebar_class_name: hello
---

But it doesn't work, please help me.

I dont see my css class

Sidebar is autogenerated

Self-service

• I'd be willing to address this documentation request myself.