jupyterhub/share/jupyter/templates/index.html

{% extends "page.html" %}

{% block main %}

<div class="container">
  <div class="row">
    <div class="text-center">
    <a id="start" class="btn btn-lg btn-primary" href="{{server_url}}">Dashboard</a>
    </div>
  </div>
</div>

{% endblock %}