title: Bootstrap 4.0 Grid System Layout not working
body: <p>I'm trying to do a layout with bootstrap, but I can't figure it out what I'm doing wrong. I'm putting two columns of 6 and the second column of 6 I'm putting 2 columns of 3 inside, but it's not working. I'm new to bootstrap.</p>
  
  <p>Here is the code:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head&gt;
   &lt;title&gt;&lt;/title&gt;
   &lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous"&gt;
   &lt;script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"&gt;&lt;/script&gt;
   &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"&gt;&lt;/script&gt;
   &lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"&gt;&lt;/script&gt;
   &lt;style type="text/css"&gt;
   &lt;/style&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;div class="container-fluid"&gt;
   &lt;div class="container"&gt;
    &lt;div class="row"&gt;
     &lt;div class="col-1 col-sm-1 col-md-1 col-xl-1" style="border-left: solid 1px #ffbfbf;"&gt;a&lt;/div&gt;
     &lt;div class="col-1 col-sm-1 col-md-1 col-xl-1" style="border-left: solid 1px #ffbfbf;"&gt;a&lt;/div&gt;
     &lt;div class="col-1 col-sm-1 col-md-1 col-xl-1" style="border-left: solid 1px #ffbfbf;"&gt;a&lt;/div&gt;
     &lt;div class="col-1 col-sm-1 col-md-1 col-xl-1" style="border-left: solid 1px #ffbfbf;"&gt;a&lt;/div&gt;
     &lt;div class="col-1 col-sm-1 col-md-1 col-xl-1" style="border-left: solid 1px #ffbfbf;"&gt;a&lt;/div&gt;
     &lt;div class="col-1 col-sm-1 col-md-1 col-xl-1" style="border-left: solid 1px #ffbfbf;"&gt;a&lt;/div&gt;
     &lt;div class="col-1 col-sm-1 col-md-1 col-xl-1" style="border-left: solid 1px #ffbfbf;"&gt;a&lt;/div&gt;
     &lt;div class="col-1 col-sm-1 col-md-1 col-xl-1" style="border-left: solid 1px #ffbfbf;"&gt;a&lt;/div&gt;
     &lt;div class="col-1 col-sm-1 col-md-1 col-xl-1" style="border-left: solid 1px #ffbfbf;"&gt;a&lt;/div&gt;
     &lt;div class="col-1 col-sm-1 col-md-1 col-xl-1" style="border-left: solid 1px #ffbfbf;"&gt;a&lt;/div&gt;
     &lt;div class="col-1 col-sm-1 col-md-1 col-xl-1" style="border-left: solid 1px #ffbfbf;"&gt;a&lt;/div&gt;
     &lt;div class="col-1 col-sm-1 col-md-1 col-xl-1" style="border-right: solid 1px #ffbfbf;border-left: solid 1px #ffbfbf;"&gt;a&lt;/div&gt;
    &lt;/div&gt;
   &lt;/div&gt;
   &lt;div class="container"&gt;
    &lt;div class="row"&gt;
     &lt;div class="col-12 col-sm-12 col-md-6 col-xl-6" style="border-left: solid 1px #ffbfbf;"&gt;&lt;div style="height: 700px; background-color: #FF3355; border-radius: 15px;"&gt;a a a a a a&lt;/div&gt;&lt;/div&gt;
     &lt;div class="col-12 col-sm-12 col-md-6 col-xl-6" style="border-left: solid 1px #ffbfbf;"&gt;
      &lt;div class="col-12 col-sm-12 col-md-6 col-xl-6" style="padding-right: 0px; padding-left:0px;border-left: solid 1px #ffbfbf;"&gt;&lt;div style="height: 320px; background-color: #FF3355; border-radius: 15px;"&gt;a&lt;/div&gt;&lt;/div&gt;
      &lt;div class="col-12 col-sm-12 col-md-6 col-xl-6" style="padding-right: 0px; padding-left:0px;border-left: solid 1px #ffbfbf;"&gt;&lt;div style="height: 320px; background-color: #FF3355; border-radius: 15px;"&gt;a&lt;/div&gt;&lt;/div&gt;
  
      &lt;div class="col-12 col-sm-12 col-md-6 col-xl-6" style="padding-right: 0px; padding-left:0px;border-left: solid 1px #ffbfbf;"&gt;&lt;div style="height: 320px; background-color: #FF3355; border-radius: 15px;"&gt;a&lt;/div&gt;&lt;/div&gt;
      &lt;div class="col-12 col-sm-12 col-md-6 col-xl-6" style="padding-right: 0px; padding-left:0px;border-left: solid 1px #ffbfbf;"&gt;&lt;div style="height: 320px; background-color: #FF3355; border-radius: 15px;"&gt;a&lt;/div&gt;&lt;/div&gt;
     &lt;/div&gt;
  
    &lt;/div&gt;
   &lt;/div&gt;
  &lt;/div&gt;
  335
  &lt;/body&gt;
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>What I want to do :</p>
  
  <p><a href="https://i.stack.imgur.com/fCtym.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/fCtym.jpg" alt="enter image description here"></a></p>
  
  <p>What I get:</p>
  
  <p><a href="https://i.stack.imgur.com/Fd1jH.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/Fd1jH.jpg" alt="enter image description here"></a></p>