JSFiddle - React, Tailwind, and code Playground

HTML

<nav>
    <div id="ribbon"></div>    
</nav>
<div id="context">
    <div class="link"></div>
</div>

CSS

#context {
    width: auto;
    padding: 20px;
    height: 300px;
    background-color: blue;
    z-index: 1;
}

#context .link {
    float: Left;
    height: 260px;
    width: 300px;
    margin-left: -140px;
    background-color: White;
    z-index:1 !important;
}
nav {
    width: auto;
    height: 65px;
    background-color: black;
    z-index:99 !important;
    clear:both;
}

nav #ribbon {
    float: left;
    margin: 0px 50px;
    Width: 65px;
    height: 130px;
    background-color: red;
    z-index:99;
    position: relative;
}