One-liner last-child style remover.

list.html

<style>
ul {
  list-style:none;
}
li {
  display: inline-block;
  padding: 5px;
}
</style>

<ul>
  <li>lorem</li>
  <li>ipsum</li>
  <li>this is the last item</li>
</ul>

old way.css

li {
  border-right:2px solid #b4da55;
}
li:last-child {
  border-right:none;
}

the new one-liner cool way.css

/*
Add the style to every item which is not the last one.
*/
li:not(:last-child) {
  border-right:2px solid #b4da55;
}