JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
    <html lang="en">
      <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="description" content="">
        <meta name="author" content="">

        <link rel="shortcut icon" href="../../docs-assets/ico/favicon.png">

        <title>TEST</title>


        <link rel="stylesheet" type="text/css" href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" >
        <link rel="stylesheet" type="text/css"href="//cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.6.2/css/bootstrap-select.min.css">
        <link rel="stylesheet" href="/static/web.css">
        <link href="http://getbootstrap.com/examples/non-responsive/non-responsive.css" rel="stylesheet">

      </head>


      <body>

        <!-- Fixed navbar -->
        <div class="navbar navbar-default navbar-fixed-top" role="navigation">
          <div class="container">
          
            <div class="navbar-header">
              <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
              </button>
              <a class="navbar-brand" href="/search/">TEST</a>
            </div>
            <div class="navbar-collapse collapse" id="navbar-collapsible">
              <ul class="nav navbar-nav navbar-left">
              
                <li class="active"><a href="/search/">Home</a></li>
              </ul>
              <ul class="nav navbar-nav navbar-right">
                <form class="navbar-form navbar-right" method="get" action="/snearch/" role="form">
                    <div class="form-group">
                        <input class="form-control" type="text" name="sid" placeholder="e.g. hello">
                        <button class="btn...

CSS

.input-group .bootstrap-select.form-control {
  z-index: inherit;
}