JSFiddle - React, Tailwind, and code Playground

HTML

<div id="window">
    <div id="oleft"></div>
    <div class="center">
        <div id="ocenter"></div>
    </div>
    <div id="oright"></div>
</div>

CSS

#window {
    width: 100%;
    height: 300px;
    position: fixed;
    z-index: 5;
}
#oleft, #oright, #ocenter, .center {
    position: absolute;
}
#oleft {
    background: #0ee;
    height: 88px;
    width: 40%;
    top: 0;
    left: 0;
}
#oright {
    background: #0ee;
    height: 88px;
    width: 40%;
    top: 0;
    left: 60%;
}
#ocenter {
    background-color: transparent;
    border-top: 88px solid transparent;
    border-left: 150px solid rgb(219, 219, 219);
    border-right: 150px solid rgb(219, 219, 219);
    height: 0;
    width: 0;
}
.center{
    max-width:300px;
    width:20%;
    top:0;
    left:40%;
}