ul {
font-size: 0;
overflow: hidden;
padding: 0;
}
li {
font-size: 16px;
display: inline-block;
margin: 0;
padding: 0;
color: gray;
position: relative;
padding-right: 2rem;
}
li::before {
content: "|";
position: relative;
left: -1rem;
font-weight: bold;
color: black;
}
<ul>
<li>Item 1</li>
<li>Another Item</li>
<li>This Is Nice</li>
<li>Another</li>
<li>And Another</li>
<li>And Yet Another</li>
</ul>