title: bootstrap shadow doesn't work with the grid system
body: <p>I have a problem with Twitter's bootstrap.
  I want to use box-shadow for my project but it doesn't work.
  When I put the box-shadow command under the relevant class in the css file nothing happens.</p>
  <p>It should work like the picture, that the shadow is under the header, navbar, and the content.</p>
  <p><a href="https://i.stack.imgur.com/fjuBi.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fjuBi.jpg" alt="enter image description here" /></a></p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>* {
    border-radius: 0 !important;
    -moz-border-radius: 0 !important;
  }
  
  .navbar-header {
    height: 247px;
    background: black;
    -webkit-box-shadow: 7px 7px 2px 0px rgba(50, 50, 50, 0.75);
    -moz-box-shadow: 7px 7px 2px 0px rgba(50, 50, 50, 0.75);
    box-shadow: 7px 7px 2px 0px rgba(50, 50, 50, 0.75);
  }
  
  .navbar {
    height: 74px;
    background: #F7a717;
    /* Muss überschrieben werden, sonst ist ein Abstand zwischen den Spalten */
    margin: 0px;
    position: relative;
  }
  
  .nav {
    font-size: 26px;
  }
  
  .nav li {
    display: inline-block;
  }
  
  .nav li a:hover {
    background: yellow;
    color: white;
  }
  
  .content {
    height: 954px;
    background: #eff3fb;
  }
  
  .footer {
    height: 284px;
    background: #254175;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt;
  &lt;html lang="en"&gt;
  
  &lt;head&gt;
    &lt;meta charset="utf-8"&gt;
    &lt;meta http-equiv="X-UA-Compatible" content="IE=edge"&gt;
    &lt;meta name="viewport" content="width=device-width, initial-scale=1"&gt;
    &lt;title&gt;Track DB&lt;/title&gt;
    &lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css"&gt;
    &lt;link rel="stylesheet" href="css/style.css"&gt;
  &lt;/head&gt;
  
  &lt;body&gt;
    &lt;div class="container-fluid"&gt;
      &lt;div class="row"&gt;
        &lt;div class="col-md-12 navbar-header"&gt;
  
        &lt;/div&gt;
      &lt;/div&gt;
  
      &lt;div class="row"&gt;
        &lt;div class="col-md-8 navbar navbar-left drop-shadow"&gt;
          &lt;ul class=" nav"&gt;
            &lt;li&gt;&lt;a href="#"&gt;Navigation1&lt;/a&gt;&lt;/li&gt;
            &lt;li&gt;&lt;a href="#"&gt;Navigation2&lt;/a&gt;&lt;/li&gt;
            &lt;li&gt;&lt;a href="#"&gt;Navigation3&lt;/a&gt;&lt;/li&gt;
            &lt;li&gt;&lt;a href="#"&gt;Navigation4&lt;/a&gt;&lt;/li&gt;
          &lt;/ul&gt;
        &lt;/div&gt;
        &lt;div class="col-md-3 navbar"&gt;
          &lt;form class="navbar-form navbar-left" role="search"&gt;
            &lt;input type="text" name="search" class="form-control input-lg" id="search" placeholder="Search"&gt;
          &lt;/form&gt;
        &lt;/div&gt;
        &lt;div class="col-md-1 navbar navbar-right drop-shadow"&gt;
  
        &lt;/div&gt;
      &lt;/div&gt;
      &lt;div class="row"&gt;
        &lt;div class="col-md-12 content"&gt;&lt;/div&gt;
      &lt;/div&gt;
      &lt;div class="row"&gt;
        &lt;div class="col-md-12 footer"&gt;
  
        &lt;/div&gt;
      &lt;/div&gt;
    &lt;/div&gt;
  
    &lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"&gt;&lt;/script&gt;
    &lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"&gt;&lt;/script&gt;
  &lt;/body&gt;
  
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>