Alterar cor do background do navbar bootstrap4

Como altero a cor de fundo da barra de menu usando css alternativo?

<!DOCTYPE html>
<html lang="PT-BR">
  <head>
 <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>NomeEmpresa</title>
    <!-- link CSS Bootstrap -->
	<link href="css/bootstrap-responsive.css" rel="stylesheet">
   <link href="css/bootstrap.css" rel="stylesheet">
   <link href="css/style.css" rel="stylesheet">
   <script src="js/jquery.js"></script>
  <script src="js/bootstrap.js"></script>
	
  </head>
  <body>

 <nav class="navbar navbar-expand navbar-light bg-light">
  <a class="navbar-brand" href="#">NomeEmpresa</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item active">
        <a class="nav-link" href="#">Início <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Dropdown
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>

<!--fim menu-->
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
  <ol class="carousel-indicators">
    <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
  </ol>
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img class="d-block w-100" src="img/catalogo.jpg" alt="First slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="img/frota.jpg" alt="Second slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="img/produtor.jpg" alt="Third slide">
    </div>
  </div>
  <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="sr-only">Previous</span>
  </a>
  <a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
  </a>
</div>
 
<div class="container-fluid">
  <h3>Basic Navbar Example</h3>
  <p>A navigation bar is a navigation header that is placed at the top of the page.</p>
  <p>The navbar-expand-xl|lg|md|sm class determines when the navbar should stack vertically (on extra large, large, medium or small screens).</p>
</div>
 
 
  </body>
</html>

</html>

não consigo!

O correto seria a classe estar toda junta, pois essas classes estão sendo referenciados no mesmo componente

.navbar.navbar-expand.bg-light {

}

Se o efeito não esta sendo aplicado, podem ser tres coisas:
-Caminho do arquivo css esta errado
-O seu estilo esta sendo sobrescrito
-Cache

Para testar se o caminho esta certo:

body {
    background-color: red !important;
}

Se a cor de fundo não mudar, então o caminho esta errado

Para testar se o seu estilo esta sendo sobrescrito:
Inspecione o componente e veja a lista de estilos dele

Para limpar o cache no Chrome:
Ctrl + F5 ou abre o inspecionar e clique/segure o botão de reload e então clica em “Esvaziar cache e recarregamento forçado”

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