JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="selector">
    <li><span>ID:SomeId8</span></li>
    <li class="selected"><span>ID:SomeId4</span></li>
    <li><span>ID:SomeId5</span></li>
    <li><span>ID:SomeId3</span></li>
    <li><span>ID:SomeId2</span></li>
</ul>

CSS

body, html
{
    margin: 0;
    padding: 0;
}
ul.selector
{
    width: 250px;
    margin: 0;
    height: 100vh;
    overflow: auto;
    background-color: #F5F9FD;
    list-style: none;
    padding: 0;
    box-shadow: inset -2px 0 2px rgba(0, 0, 0, 0.05), inset -1px 0 0 #C4CAD2;
}
ul.selector li
{
    padding: 10px;
    height: 50px;
    line-height: 50px;
    position: relative;
    margin: 0;
    border-bottom: 1px solid #C4CAD2;
}
ul.selector li.selected
{
    background-color: white;
}
ul.selector li.selected:after
{
    position: absolute;
    right: 0px;
    background-color: white;
    top: 0;
    bottom: 0;
    content: " ";
    width: 1px;
}