JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://getbootstrap.com/dist/css/bootstrap.min.css">
<script src="http://getbootstrap.com/dist/js/bootstrap.min.js"></script>
<div class="navbar" style="width:75%;">
    <div class="navbar-collapse collapse navbar-responsive-collapse"></div>
    
<br><br><br>
    <h3>Wanted outcome (shape wise):</h3>
    <img src="http://i.gyazo.com/3e9c3430627bd8eec353d1de659c1781.png">

CSS

body {
    background-image: url("http://freedesignfile.com/upload/2014/07/Shiny-eco-style-green-background-vector-01.jpg");
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-size: cover;
    width: 100%;
    height: 100%;
}
.navbar {
    position: relative;
    min-height: 50px;
    margin-bottom: 20px;
    border: 1px solid transparent;
    height: 20px;
    width: 100px;
    border-bottom: 50px solid rgba(58, 162, 178, 0.5);
    border-left: 50px solid transparent;
    
    /* Tried */
    border-top-right-radius: 2em;
}