<div>
  <ol>
    <li>Item #1</li>
    <li>Item #2</li>
    <li>Item #3</li>
    <li>Item #4</li>
    <li>Item #5</li>
  </ol>
</div>
<div>
  <ol>
    <li>Item #1</li>
    <li>Item #2</li>
    <li>Item #3</li>
    <li>Item #4</li>
    <li>Item #5</li>
  </ol>
</div>

body {
  display: flex;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
  font-family: Roboto, "Helvetica Neue", Arial, sans-serif;
}
ol {
  counter-reset: custom;
  list-style-type: none;
  padding: 0;
  margin: 0px 20px;
  li {
    counter-increment: custom;
    padding: 15px 0;
    display: flex;
    align-items: center;
    &:before {
      content: counters(custom, ".") " ";
      width: 30px;
      height: 30px;
      margin-right: 10px;
      background: purple;
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
    }
  }
}