choosealicense.com/_includes/sidebar.html

<div class="sidebar">

  <a href="#" data-clipboard-target="#license-text" data-proofer-ignore="true" class="js-clipboard-button button">Copy license text to clipboard</a>
  <h3 id="suggest-this-license">Suggest this license</h3>
  <div class="repository-suggestion">    
    <p>Make a pull request to suggest this license fo a project that is <a href="/no-permission/">not licensed</a>. Please be polite: see if a license has already been suggested, try to suggest a license fitting for the project's <a href="/community/">community</a>, and keep your communicaton with project maintainers friendly.</p>
    <div class="input-wrapper">
      <input type="text" data-license-id="{{ page.spdx-id }}" placeholder="Enter GitHub repository URL" id="repository-url" title="status" />
      <div class="status-indicator"></div>
    </div>
  </div>

  <div class="how-to-apply">
    <h3>How to apply this license</h3>
    <p>
      {{ page.how | markdownify | remove: '<p>' | remove: '</p>' }}
    </p>
    {% if page.note %}
    <p class="note">
      <strong>Note: </strong> {{ page.note | markdownify | remove: '<p>' | remove: '</p>' }}
    </p>
    {% endif %}
    {% assign xgpl = false %}
    {% if page.spdx-id contains 'GPL' %}{% assign xgpl = true %}{% endif %}
    <p class="note"><strong>Optional: </strong> Add <strong><code>{{ page.spdx-id }}{% if xgpl %}-or-later{% endif %}</code></strong>{% if xgpl %} (or <strong><code>{{ page.spdx-id }}-only</code></strong> to disallow future versions){% endif %} to your project's package description, if applicable (e.g., <a href="https://docs.npmjs.com/files/package.json#license">Node.js</a>, <a href="https://guides.rubygems.org/specification-reference/#license=">Ruby</a>, and <a href="https://doc.rust-lang.org/cargo/reference/manifest.html#package-metadata">Rust</a>). This will ensure the license is displayed in package directories.</p>
  </div>

  <div class="source">
    <a href="https://spdx.org/licenses/{{ page.spdx-id }}.html">
      <span class="license-sprite"></span>
      Source
    </a>
  </div>

  {% if page.using %}
  <div class="projects-with-license">
    <h3>Who's using this license?</h3>
    <ul>
      {% for using in page.using %}
        {% for hash in using %}
          <li><a href="{{ hash[1] }}" target="_blank">{{ hash[0] }}</a></li>
        {% endfor %}
      {% endfor %}
    </ul>
  </div>
  {% endif %}

</div> <!-- /sidebar -->