var section = document.createElement('section');
section.className = 'avenue-messenger minimized';
section.style.position = 'fixed';
section.style.bottom = '20px';
section.style.right = '20px';
section.style.width = '360px';
section.style.height = '500px';
section.style.zIndex = '9999';

section.innerHTML = `
  <iframe
    src="https://softapi.softmarketing.com.br/hnsg/chat"
    width="100%"
    height="100%"
    frameborder="0"
    style="border:0"
    title="WebChat Softinova"
  ></iframe>
`;

document.body.appendChild(section);