<style>
.example {
  display: inline-block;
  width: 200px;
  height: 200px;
  border: 1px solid black;
  background-repeat: no-repeat;
  background-size: 30px 30px;
  background-image: linear-gradient(red, red);
}
</style>
<b>background-position-x</b><br>
<div class="example" style="background-position-x: left"></div>
<div class="example" style="background-position-x: center"></div>
<div class="example" style="background-position-x: 25%"></div>
<div class="example" style="background-position-x: 2rem"></div>
<div class="example" style="background-position-x: right 32px"></div>
<div class="example" style="background-position-x: right"></div>
<br>
<br>
<b>background-position-y</b><br>
<div class="example" style="background-position-y: top"></div>
<div class="example" style="background-position-y: center"></div>
<div class="example" style="background-position-y: 25%"></div>
<div class="example" style="background-position-y: 2rem"></div>
<div class="example" style="background-position-y: bottom 32px"></div>
<div class="example" style="background-position-y: bottom"></div>