Arkadaşlar sliderin arkasında renk vermek istiyorum ya da foto eklemek deneme amaçlı yapıyorum ama çalışmıyor. Background rengi verecem bir türlü veremedim. Her bölüme bir section id belirliyorum daha sonrada o css de id ye renk vermeye çalışıyorum olmadı tüm kodları paylaşıyorum

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
      
      <!-- Google Font -->
     <link href="https://fonts.googleapis.com/css?family=Oswald" rel="stylesheet">
      <!-- FONT AVESOME -->
      <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
      <!-- FONT AVESOME -->
      <link rel="stylesheet" href="css/style.css">
    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
    <title>Yeni Projem</title>
  </head>
  <body>
      
    
      
    <!-- NAVBARIMIZI YAPIYORUZ -->
       <nav class="navbar navbar-expand-lg navbar-light  bg-dark">
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo01" aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarTogglerDemo01">
    <a class="navbar-brand" href="#" style="font-size: 15px";>Zorbilgi.com</a>
    <ul class="navbar-nav ml-auto mt-2 mt-lg-0 ">
      <li class="nav-item active ">
        <a class="nav-link" href="#">Anasayfa <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Hakkımda</a>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">İletişim</a>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control mr-sm-2" type="search" placeholder="Site İçi Arama" aria-label="Search">
      <button class="btn btn-info my-2 my-sm-0" type="submit">Ara</button>
    </form>
  </div>
</nav>
        
         <!-- Reklam Alanı -->
      
      <header id="reklamalani">
      <div class="container-fluid" style="padding: 0;">
        <div class="row">
          <div class="col-md-3 ">
            <a href="zorbilgi.com" >
<img class="logoyer" border="0" alt="W3Schools" src="images/zorson.png" width="100" height="100">
</a>
            
            
        </div>
        <div class="col-md-9">
             <a href="zorbilgi.com" >
<img class="logoyer" border="0" alt="W3Schools" src="images/reklambanner.jpg" width="768" height="90">
</a>
          
        </div>  
          
          
          
          
        </div>
          </div>
      
      </header>
      <!-- NAVBARIMIZI 2 YAPIYORUZ -->
      <section id="nav2">
      <nav class="navbar navbar-expand-lg navbar-light ">
  
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarNav">
    <ul class="navbar-nav">
      <li class="nav-item active">
        <a class="nav-link kale" href="#">Anasayfa<span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">C++ Programala</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Wordpress Kurulumu</a>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Teknoloji</a>
      </li>
    </ul>
  </div>
</nav>
          </section>
      <!-- slider -->
      <selection id="kalem">
          <div class="container mt-2 ">
              <div class="row">
                  <div class="col-md-7">
      <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 sliderboyut" src="images/nav1.jpg" alt="First slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100 sliderboyut" src="images/nav2.jpg"  alt="Second slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100 sliderboyut" src="images/nav3.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>
                  </div>
              </div>
              
      </selection>
      <selection id="name12">
          <div class="container">
              <div class="row">
          <div class="col-md-8">
              back ground veremiyorum
              
              </div>
              </div>
          </div>
      </selection>
      
    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
  </body>
</html>
CSS DOSYASIDA BU ARKADAŞLAR
.nav-link{ color: white !important; font-size: 15px; } .navbar-brand{ color: white !important; } .navbar{ padding-bottom: 0; padding-left: 0; } .logoyer{ float: left; margin-left: 50px; margin-top: 7px; margin-bottom: 7px; } #reklamalani{ background-color:#fff0f5; } #nav2 .nav-link{ font-size: 18px; } #nav2{ background-color: #87cefa; font-family: 'Oswald', sans-serif; } } #nav2 .nav-link{ cursor: pointer; color:aliceblue !important; } #nav2 .nav-link:hover{ color:dodgerblue !important; opacity: 1 !important; } .sliderboyut{ width: 400px; height: 400px; } .sliderboyut2{ width: 400px; height: 200px; } #kalem{ background-color:dodgerblue; background-size: cover; }