Blog

{
// add button on sidebar
  const button =        '<a href="https://subscribe.sinan.pl"><button class="btn btn-success" id=subscribe-button>       Subscribe to my blog</button></a>';
  const button_mobile = '<a href="https://subscribe.sinan.pl"><button class="btn btn-success" id=subscribe-button-mobile>Subscribe to my blog</button></a>';
  const sidebar = document.querySelector('#quarto-margin-sidebar');
  const extraContent = document.createElement('div');
  extraContent.innerHTML = button;
  sidebar.appendChild(extraContent);

// same with main doc
  const maindoc = document.querySelector('#quarto-document-content');
  const buttonmobile = document.createElement('div');
  buttonmobile.innerHTML = button_mobile;
  maindoc.prepend(buttonmobile);
}