span>
              </p>
              <a href="#" class="btn btn-primary"><span>Go</span> <span>somewhere</span></a>
            </div>
          </div>
          <a href="#" class="btn btn-success m-3" onclick="togglePhfy(event, '.example-4')">Toggle</a>
        </div>
      </div>
    </div>

    <div class="example-opacity">
      <div class="row">
        <div class="col">
          <h2>Custom opacity and animation color example</h2>
        </div>
      </div>
      <style>
        .example-opacity {
