Centrar position absolute

CodiLink logo codi.link

<div class="container">
  <h1>item 1</h1>
  <small class="absolute">#</small>
</div>   

<style>

.container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.absolute {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%)
}

</style>
          

Otra forma de hacerlo

CodiLink logo codi.link

<div class="container">
  <h1>item 1</h1>
  <div class="absolute">
    <small>#</small>
  </div>
</div>   

<style>

.container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.absolute {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
}

</style>