Bonjour
Svp j'ai ces 4 elements(header, section_one, section_two, section_three) j'aimerais supprimer tous les espaces verticaux qui les sépares, j'aimerais que tous ces éléments soient collés verticalement. Comment faire svp ?
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<!DOCTYPE html>
 
<html>
   <head>
       <!-- Metatags, links to Bootstrap and stylesheets -->
<title>xxxxxxxxxxxxxxx</title>
<meta name="description" content="Page description. No longer than 155 characters." />
 
 
<!-- Twitter Card data -->
<meta name="twitter:card" value="summary">
 
 
<!-- Open Graph data -->
<meta property="og:title" content="xxxxxxxxxxxxxxxx" />
<meta property="og:type" content="website" />
<meta property="og:url" content="http://www.example.com/" />
<meta property="og:image" content="http://example.com/image.jpg" />
<meta property="og:description" content="Description Here" />
 
 
<!-- Bootstrap core CSS -->
   <link href="css/bootstrap.min.css" rel="stylesheet" type="text/css">
   <link href="css/bootstrap.css" rel="stylesheet" type="text/css">
   <link href="style.css" rel="stylesheet" type="text/css">
   </head>
<body>
 
 
 
 
 
    <!-- Header -->
       <header>
      <div class="container">
   <nav id="menu" class="col-md-12" style="background-color: blue"> </nav>
 
 
   <div class="col-md-12 home" style="background-image: url('img/about-bg.jpg')"></div>
 
 
   </div>
   </header>
 
 
   <div class="container">
   <!-- Section 1 -->
   <section id="section_one" style="background-image: url('img/post-bg.jpg')">
       <div class="row">
           <div class="col-md-12"></div>
       </div>
   </section> 
 
 
<!-- Section 2 -->
   <section id="section_two" style="background-image: url('img/contact-bg.jpg')">
       <div class="row">
           <div class="col-md-12"></div>
       </div>
   </section> 
 
 
<!-- Section 3 -->
   <section id="section_three" style="background-image: url('img/home-bg.jpg')">
       <div class="row">
           <div class="col-md-12"></div>
       </div>
   </section> 
 
   <footer style="background-color: blue">
  <div class="row">
             <div class="col-md-12"></div>
    </div>
   </footer>
</div>
 
 
<!-- Bootstrap core JavaScript -->
    <script src="js/jquery.min.js"></script>
    <script src="js/bootstrap.bundle.min.js"></script>
</body>
 
 
 
</html>