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HTML

              
                <div class="container-fluid">
  <div class="row modaldisable">
    <div class="col-md p-0 m-0 bg-info">
      <div class="container-fluid bg-secondary" id="topsection">
        <div class="row">
          <div class="col-12">
            <header class="container-fluid limiter pt-4">
              <a><svg class="logo" xmlns="https://www.w3.org/2000/svg" xmlns:xlink="https://www.w3.org/1999/xlink" viewBox="0 0 328 132">
                  <path d="M8.219,53.827A12.263,12.263,0,0,0,10.4,60.383q3.3,4.134,11.443,4.133a17.156,17.156,0,0,0,8.535-2.066,6.838,6.838,0,0,0,3.685-6.39,5.449,5.449,0,0,0-2.946-4.988,35.424,35.424,0,0,0-7.435-2.423l-6.9-1.711a33.992,33.992,0,0,1-9.753-3.61q-5.6-3.468-5.6-9.6A14.583,14.583,0,0,1,6.7,22.044q5.273-4.466,14.179-4.466,11.652,0,16.8,6.746a14.523,14.523,0,0,1,3.131,9.217H32.734A9.693,9.693,0,0,0,30.643,28.3q-3.015-3.356-10.457-3.355-4.96,0-7.514,1.846a5.74,5.74,0,0,0-2.552,4.876,5.984,5.984,0,0,0,3.355,5.3,20.366,20.366,0,0,0,5.711,2.086l5.761,1.378q9.39,2.233,12.585,4.323,4.988,3.278,4.988,10.31A15.621,15.621,0,0,1,37.3,66.8q-5.218,4.941-15.9,4.941-11.5,0-16.281-5.155A19.359,19.359,0,0,1,0,53.827Z" />
                  <path d="M55.989,18.908,69.577,60.336,83.734,18.908h9.359L73.939,69.79H64.826L46.06,18.908Z" />
                  <path d="M128.72,20.951a23.488,23.488,0,0,1,4.922,4.846V19.383h7.886V65.657q0,9.692-2.84,15.3-5.3,10.356-20.029,10.356A24.51,24.51,0,0,1,104.88,87.63q-5.587-3.684-6.252-11.521h8.694a9.69,9.69,0,0,0,2.457,5.273q2.882,2.851,9.072,2.851,9.781,0,12.8-6.936,1.8-4.087,1.654-14.585a16.731,16.731,0,0,1-6.152,5.8,21.991,21.991,0,0,1-23.922-3.967q-6.176-5.867-6.175-19.407,0-12.78,6.223-19.954t15.026-7.173A18.426,18.426,0,0,1,128.72,20.951Zm1.046,9.169a12.393,12.393,0,0,0-9.879-4.56q-8.98,0-12.289,8.456a33.317,33.317,0,0,0-1.749,11.83q0,8.6,3.474,13.088a11.194,11.194,0,0,0,9.336,4.49q9.168,0,12.9-8.314a26.927,26.927,0,0,0,2.08-10.975Q133.642,34.682,129.766,30.12Z" />
                  <path d="M154.783,0h8.551V69.79h-8.551Z" />
                  <path d="M213.028,23.987q6.747,6.551,6.747,19.27,0,12.3-5.944,20.317T195.385,71.6q-10.426,0-16.559-7.1t-6.133-19.059q0-12.816,6.463-20.411t17.361-7.594A22.8,22.8,0,0,1,213.028,23.987ZM207.719,57.8A32.3,32.3,0,0,0,210.843,43.5q0-7.116-2.256-11.578-3.568-7.022-12.307-7.023-7.752,0-11.274,5.98A27.931,27.931,0,0,0,181.483,45.3q0,8.117,3.523,13.524t11.18,5.41Q204.6,64.232,207.719,57.8Z" />
                  <path d="M258.561,20.951a23.464,23.464,0,0,1,4.922,4.846V19.383h7.886V65.657q0,9.692-2.841,15.3-5.3,10.356-20.028,10.356a24.512,24.512,0,0,1-13.779-3.681q-5.587-3.684-6.252-11.521h8.694a9.683,9.683,0,0,0,2.457,5.273q2.881,2.851,9.072,2.851,9.781,0,12.8-6.936,1.8-4.087,1.654-14.585a16.736,16.736,0,0,1-6.151,5.8,21.992,21.992,0,0,1-23.923-3.967Q226.9,58.673,226.9,45.133q0-12.78,6.223-19.954t15.026-7.173A18.43,18.43,0,0,1,258.561,20.951Zm1.046,9.169a12.393,12.393,0,0,0-9.879-4.56q-8.981,0-12.289,8.456a33.317,33.317,0,0,0-1.749,11.83q0,8.6,3.474,13.088a11.193,11.193,0,0,0,9.336,4.49q9.168,0,12.9-8.314a26.943,26.943,0,0,0,2.08-10.975Q263.483,34.682,259.607,30.12Z" />
                  <path d="M321.253,23.987Q328,30.538,328,43.257q0,12.3-5.944,20.317T303.61,71.6q-10.427,0-16.559-7.1t-6.133-19.059q0-12.816,6.463-20.411t17.361-7.594A22.8,22.8,0,0,1,321.253,23.987ZM315.944,57.8A32.3,32.3,0,0,0,319.068,43.5q0-7.116-2.256-11.578-3.57-7.022-12.307-7.023-7.753,0-11.274,5.98A27.931,27.931,0,0,0,289.708,45.3q0,8.117,3.523,13.524t11.18,5.41Q312.82,64.232,315.944,57.8Z" />
                </svg></a>
              <span class="sr-only">Business name</span>
            </header>
            <div class="container limiter">
              <div class="row">
                <div class="col-12 pt-4 pb-5">
                  <h1>Left content top</h1>
                  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. In nulla elit, eleifend non risus eget, ultricies condimentum neque. In semper, risus nec faucibus sodales, orci nisl fermentum nisi, eu congue ex dui at neque. Quisque volutpat lorem sem, nec porta odio hendrerit id. Etiam ultrices sodales vulputate. Proin blandit ligula leo, non cursus eros tincidunt nec. Aliquam sagittis mattis luctus. Suspendisse ex arcu, dictum ac ex rhoncus, imperdiet feugiat leo. Suspendisse augue mauris, sodales non turpis ac, bibendum pellentesque quam. Mauris dapibus aliquam massa, ut consequat ex interdum ac. Fusce id commodo lorem. Fusce et maximus lacus.</p>
                  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. In nulla elit, eleifend non risus eget, ultricies condimentum neque. In semper, risus nec faucibus sodales, orci nisl fermentum nisi, eu congue ex dui at neque. Quisque volutpat lorem sem, nec porta odio hendrerit id. Etiam ultrices sodales vulputate. Proin blandit ligula leo, non cursus eros tincidunt nec. Aliquam sagittis mattis luctus. Suspendisse ex arcu, dictum ac ex rhoncus, imperdiet feugiat leo. Suspendisse augue mauris, sodales non turpis ac, bibendum pellentesque quam. Mauris dapibus aliquam massa, ut consequat ex interdum ac. Fusce id commodo lorem. Fusce et maximus lacus.</p>
                  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. In nulla elit, eleifend non risus eget, ultricies condimentum neque. In semper, risus nec faucibus sodales, orci nisl fermentum nisi, eu congue ex dui at neque. Quisque volutpat lorem sem, nec porta odio hendrerit id. Etiam ultrices sodales vulputate. Proin blandit ligula leo, non cursus eros tincidunt nec. Aliquam sagittis mattis luctus. Suspendisse ex arcu, dictum ac ex rhoncus, imperdiet feugiat leo. Suspendisse augue mauris, sodales non turpis ac, bibendum pellentesque quam. Mauris dapibus aliquam massa, ut consequat ex interdum ac. Fusce id commodo lorem. Fusce et maximus lacus.</p>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
      <div class="col-12 d-md-none bg-warning modalbutton" id="modalbutton">
        <button type="button" class="btn btn-primary" data-toggle="modal" data-target="#modalExample">
          Sticky button when scroll past: Opens form / modal
        </button>
      </div>
      <div class="container-fluid" id="bottomsection">
        <div class="row">
          <div class="col-md-12">
            <div class="container limiter">
              <div class="row">
                <div class="col-12 py-5">
                  <h1>Left content bottom</h1>
                  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. In nulla elit, eleifend non risus eget, ultricies condimentum neque. In semper, risus nec faucibus sodales, orci nisl fermentum nisi, eu congue ex dui at neque. Quisque volutpat lorem sem, nec porta odio hendrerit id. Etiam ultrices sodales vulputate. Proin blandit ligula leo, non cursus eros tincidunt nec. Aliquam sagittis mattis luctus. Suspendisse ex arcu, dictum ac ex rhoncus, imperdiet feugiat leo. Suspendisse augue mauris, sodales non turpis ac, bibendum pellentesque quam. Mauris dapibus aliquam massa, ut consequat ex interdum ac. Fusce id commodo lorem. Fusce et maximus lacus.</p>
                  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. In nulla elit, eleifend non risus eget, ultricies condimentum neque. In semper, risus nec faucibus sodales, orci nisl fermentum nisi, eu congue ex dui at neque. Quisque volutpat lorem sem, nec porta odio hendrerit id. Etiam ultrices sodales vulputate. Proin blandit ligula leo, non cursus eros tincidunt nec. Aliquam sagittis mattis luctus. Suspendisse ex arcu, dictum ac ex rhoncus, imperdiet feugiat leo. Suspendisse augue mauris, sodales non turpis ac, bibendum pellentesque quam. Mauris dapibus aliquam massa, ut consequat ex interdum ac. Fusce id commodo lorem. Fusce et maximus lacus.</p>
                  <h2>Left content bottom</h2>
                  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. In nulla elit, eleifend non risus eget, ultricies condimentum neque. In semper, risus nec faucibus sodales, orci nisl fermentum nisi, eu congue ex dui at neque. Quisque volutpat lorem sem, nec porta odio hendrerit id. Etiam ultrices sodales vulputate. Proin blandit ligula leo, non cursus eros tincidunt nec. Aliquam sagittis mattis luctus. Suspendisse ex arcu, dictum ac ex rhoncus, imperdiet feugiat leo. Suspendisse augue mauris, sodales non turpis ac, bibendum pellentesque quam. Mauris dapibus aliquam massa, ut consequat ex interdum ac. Fusce id commodo lorem. Fusce et maximus lacus.</p>
                  <h2>Left content bottom</h2>
                  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. In nulla elit, eleifend non risus eget, ultricies condimentum neque. In semper, risus nec faucibus sodales, orci nisl fermentum nisi, eu congue ex dui at neque. Quisque volutpat lorem sem, nec porta odio hendrerit id. Etiam ultrices sodales vulputate. Proin blandit ligula leo, non cursus eros tincidunt nec. Aliquam sagittis mattis luctus. Suspendisse ex arcu, dictum ac ex rhoncus, imperdiet feugiat leo. Suspendisse augue mauris, sodales non turpis ac, bibendum pellentesque quam. Mauris dapibus aliquam massa, ut consequat ex interdum ac. Fusce id commodo lorem. Fusce et maximus lacus.</p>
                  <h2>Left content bottom</h2>
                  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. In nulla elit, eleifend non risus eget, ultricies condimentum neque. In semper, risus nec faucibus sodales, orci nisl fermentum nisi, eu congue ex dui at neque. Quisque volutpat lorem sem, nec porta odio hendrerit id. Etiam ultrices sodales vulputate. Proin blandit ligula leo, non cursus eros tincidunt nec. Aliquam sagittis mattis luctus. Suspendisse ex arcu, dictum ac ex rhoncus, imperdiet feugiat leo. Suspendisse augue mauris, sodales non turpis ac, bibendum pellentesque quam. Mauris dapibus aliquam massa, ut consequat ex interdum ac. Fusce id commodo lorem. Fusce et maximus lacus.</p>
                  <h2>Left content bottom</h2>
                  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. In nulla elit, eleifend non risus eget, ultricies condimentum neque. In semper, risus nec faucibus sodales, orci nisl fermentum nisi, eu congue ex dui at neque. Quisque volutpat lorem sem, nec porta odio hendrerit id. Etiam ultrices sodales vulputate. Proin blandit ligula leo, non cursus eros tincidunt nec. Aliquam sagittis mattis luctus. Suspendisse ex arcu, dictum ac ex rhoncus, imperdiet feugiat leo. Suspendisse augue mauris, sodales non turpis ac, bibendum pellentesque quam. Mauris dapibus aliquam massa, ut consequat ex interdum ac. Fusce id commodo lorem. Fusce et maximus lacus.</p>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
    <!-- <div class="col-4 bg-primary">Sidebar</div> -->
    <div class="col-12 col-md-4 bg-primary modal fade demodal-md mw-400" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true" id="modalExample">
      <div class="modal-dialog m-0 mx-sm-auto w-100" role="document" id="sidebar">
        <div class="modal-content sidebar__inner py-5">
          <div class="modal-header">
            <h5 class="modal-title" id="exampleModalLongTitle">On desktop, this sidebar scrolls with the screen but fixed to its limits via StickySidebar.js. On mobile, it is then accessed via a sticky-when-scrolled-beyond button. This is using Bootstrap 4.5 with near zero edits.</h5>
            <button type="button" class="close d-md-none" data-dismiss="modal" aria-label="Close">
              <span aria-hidden="true">&times;</span>
            </button>
          </div>
          <div class="modal-body">
            <p>This form is comedically long... We find conversion rates are better with fixed forms on desktop but really poor UX on mobile. This keeps the form visible despite length of content.</p>
            <p>Hiding the modal-on-mobile function is disabled with .modaldisable on a parent element (body or other). This is ideal on a short page.</p>
            <p>Lorem ipssum dolor sit amet, consectetur adipiscing elit. In nulla elit, eleifend non risus eget, ultricies condimentum neque. In semper, risus nec faucibus sodales, orci nisl fermentum nisi, eu congue ex dui at neque. Quisque volutpat lorem sem, nec porta odio hendrerit id. Etiam ultrices sodales vulputate. Proin blandit ligula leo, non cursus eros tincidunt nec. Aliquam sagittis mattis luctus. Suspendisse ex arcu, dictum ac ex rhoncus, imperdiet feugiat leo. Suspendisse augue mauris, sodales non turpis ac, bibendum pellentesque quam. Mauris dapibus aliquam massa, ut consequat ex interdum ac. Fusce id commodo lorem. Fusce et maximus lacus.

              Lorem ipsum dolor sit amet, consectetur adipiscing elit. In nulla elit, eleifend non risus eget, ultricies condimentum neque. In semper, risus nec faucibus sodales, orci nisl fermentum nisi, eu congue ex dui at neque. Quisque volutpat lorem sem, nec porta odio hendrerit id. Etiam ultrices sodales vulputate. Proin blandit ligula leo, non cursus eros tincidunt nec. Aliquam sagittis mattis luctus. Suspendisse ex arcu, dictum ac ex rhoncus, imperdiet feugiat leo. Suspendisse augue mauris, sodales non turpis ac, bibendum pellentesque quam. Mauris dapibus aliquam massa, ut consequat ex interdum ac. Fusce id commodo lorem. Fusce et maximus lacus.</p>
          </div>
          <div class="modal-footer">
            <button type="button" class="btn btn-primary">Submit</button>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>
              
            
!

CSS

              
                .container.limiter {
  max-width: 992px;
}
.logo {
  display: block;
  height: 2.8rem;
  margin: 0;
  padding: 0;
  width: auto;
  fill: #fff200;
}
header {
  z-index: 10000;
  margin: 0 auto;
}
@media (min-width: 768px) {
  .demodal-md {
    height: auto;
    width: auto;
    opacity: 1 !important;
    position: relative !important;
    display: flex !important;
  }
  .demodal-md.modal.fade .modal-dialog {
    transform: none;
  }
  .mw-400 {
    max-width: 400px;
  }
}

.modal-backdrop {
  display: none;
}

.modaldisable .modalbutton {
  display: none;
}
.modaldisable .modal {
  height: auto;
  width: auto;
  opacity: 1 !important;
  position: relative !important;
  display: flex !important;
}
.modaldisable .modal.fade .modal-dialog {
  transform: none;
  margin: 0;
  max-width: none;
}
.modaldisable .modal-header .close {
  display: none;
}
              
            
!

JS

              
                var sidebar = new StickySidebar("#sidebar", {
  containerSelector: "#modalExample",
  innerWrapperSelector: ".sidebar__inner",
  topSpacing: 0,
  bottomSpacing: 0,
  resizeSensor: true,
  stickyClass: "is-affixed",
  minWidth: 768
});

// stickybutton when scroll beyond
document.addEventListener("DOMContentLoaded", function () {
  window.addEventListener("scroll", stickybutton);
  window.addEventListener("resize", reget);
  
  var button = document.getElementById("modalbutton"),
      bsection = document.getElementById("bottomsection");
  var y = button.offsetTop,
      yh = button.offsetHeight;  
  reget();
  
  function reget() {
    button.classList.remove("fixed-top");
    bsection.style.marginTop = 0;
    y = button.offsetTop;
    yh = button.offsetHeight;
    stickybutton();
  }
  function stickybutton() {
    if (window.scrollY > y) {
      button.classList.add("fixed-top");
      bsection.style.marginTop = yh + "px";
    } else {
      button.classList.remove("fixed-top");
      bsection.style.marginTop = 0;
    }
  }
});

              
            
!
999px

Console