JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
  
  <li>item1</li>
  
  <li>item2</li>
  
  <li>item3</li>
</ul>

CSS

body {
  font-size: 14px;
  font-family: Helvetica;
}

ul {
  margin-left: 0;
  padding-left: 0;
  list-style-type: none;
}

li {
  position: relative;
  left: 1em;
}

li:before{
  position:aboslute;
  margin-right:1em;
  content:'-';
}