templates/navbar.html

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title></title>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.bundle.min.js">
    <link rel="stylesheet" href="../static/css/mycss.css">


<style media="screen">
  .h1{
    text-align: center;
    text-shadow: 2px 2px 10px black;
    font-size: 4em;
    margin-bottom: 10px;
  }
.h2{
  text-align: center;
  text-shadow: 2px 2px 10px black;
  font-size: 3em;
  margin-bottom: 30px;
}
.b1{
  margin-left: 45%;
}
.control-label{
  text-shadow: 2px 2px 50px black;
  font-size: 25px;
}

</style>

  </head>
  <body>
    <nav class="navbar navbar-expand-md bg-dark navbar-dark">
      <a class="navbar-brand" href="{{url_for('home')}}">WordCloud API</a>
      <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsibleNavbar">
        <span class="navbar-toggler-icon"></span>
      </button>
      <div class="collapse navbar-collapse" id="collapsibleNavbar">
        <ul class="navbar-nav">
          <li class="nav-item">
            <a class="nav-link" href="{{url_for('home')}}">Home</a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="https://getpython.wordpress.com/about-us/">About us</a>
          </li>

        </ul>
      </div>
    </nav>
    {% block content %}

    {% endblock %}

    <!-- {% block footer %}
    <div class="jumbotron">
      <h1>Thankyou </h1>

    </div>
    {% endblock%} -->

  </body>
</html>