Can we Stack Multiple Sticky Elements on Top of Each Other in Pure CSS?

Implementing multiple stacked absolutely positioned sticky elements in pure CSS

Question:

Is it possible in pure CSS How to stack multiple sticky elements on top of each other?

Example:

https://webthemez.com/demo/sticky-multi-header-scroll/index.html

I prefer Use pure CSS, not JavaScript implementation. I've tried multiple sticky elements but I can't stop them from squeezing out other sticky elements. I tried putting them in the same stacking context:

#sticky .sticky-1,
#sticky .sticky-2
{
  position: sticky;
}
#sticky .sticky-1
{
  top: 1em;
  z-index: 1;
}
#sticky .sticky-2
{
  top: 2em;
  z-index: 1;
}

but it didn't work as you can see in the .html snippet below. Any insights would be greatly appreciated!

<code class="html"><div id="container">
  <article id="sticky">
    <header>
    </header>
    <main>
      <h1 class="sticky-1">Sticky heading</h1 >
      <p>here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. Some copy goes here. </p>
    </main>
    <section>
      <h2 class="sticky-2">Both headings should stick at the same time.</h2 ></code>

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