JSFiddle - React, Tailwind, and code Playground

HTML

<div id="menu"></div>
<div id="content">
    <div class="text"></div>
    <div class="text"></div>
    <div class="text"></div>
    <div class="text"></div>
</div>

CSS

body {
    margin: 0;
}
#menu {
    position: fixed;
    top: 0;
    right: calc(50% + 200px);
    bottom: 0;
    left: 0;
    background: #f0f0f0;
}
.menu-list {
    margin: 50px 0 0 100px;
    padding: 0;
    list-style: none;
    text-align: center;
}
#content {
    position: relative;
    z-index: 1;
    width: 400px;
    margin: auto;
}
.text {
    height: 200px;
}
.text:after {
    content: "";
    display: inline-block;
    width: 40px;
    height: 40px;
    margin: 0 0 0 -20px;
    border-radius: 50%;
    background: #fff;
}