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HTML

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About the <head>

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Insecure Resource

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="wrapper">
  <!-- Sidebar Holder -->
  <nav id="sidebar">
    <div class="sidebar-header">
      <h3>Bootstrap Sidebar</h3>
    </div>

    <ul class="list-unstyled components">
      <p>Dummy Heading</p>
      <li class="active">
        <a href="#homeSubmenu" data-toggle="collapse" aria-expanded="false">Home</a>
        <ul class="collapse list-unstyled" id="homeSubmenu">
          <li><a href="#">Home 1</a></li>
          <li><a href="#">Home 2</a></li>
          <li><a href="#">Home 3</a></li>
        </ul>
      </li>
      <li>
        <a href="#">About</a>
        <a href="#pageSubmenu" data-toggle="collapse" aria-expanded="false">Pages</a>
        <ul class="collapse list-unstyled" id="pageSubmenu">
          <li><a href="#">Page 1</a></li>
          <li><a href="#">Page 2</a></li>
          <li><a href="#">Page 3</a></li>
        </ul>
      </li>
      <li>
        <a href="#">Portfolio</a>
      </li>
      <li>
        <a href="#">Contact</a>
      </li>
    </ul>

    <ul class="list-unstyled CTAs">

      <li><a href="https://bootstrapious.com/p/bootstrap-sidebar" class="article">Back to the article</a></li>
    </ul>
  </nav>

  <!-- Page Content Holder -->
  <div id="content">

    <nav class="navbar navbar-default">
      <div class="container-fluid">

        <div class="navbar-header">
          <button type="button" id="sidebarCollapse" class="navbar-btn">
                                <span></span>
                                <span></span>
                                <span></span>
                            </button>
        </div>

        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
          <ul class="nav navbar-nav navbar-right">
            <li><a href="#">Page</a></li>
            <li><a href="#">Page</a></li>
            <li><a href="#">Page</a></li>
            <li><a href="#">Page</a></li>
          </ul>
        </div>
      </div>
    </nav>

    <h2>Collapsible Sidebar Using Bootstrap 3</h2>

    <p class="lead">This pen is a part of a <a href="https://bootstrapious.com/p/bootstrap-sidebar">Bootstrap sidebar tutorial</a> from Bootstrapious.com. CC-BY licensed.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure
      dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure
      dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

    <div class="line"></div>

    <h2>Lorem Ipsum Dolor</h2>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure
      dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

    <div class="line"></div>

    <h2>Lorem Ipsum Dolor</h2>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure
      dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

    <div class="line"></div>

    <h3>Lorem Ipsum Dolor</h3>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure
      dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
  </div>
</div>
!

CSS 

              
                /*
    DEMO STYLE
*/
@import "https://fonts.googleapis.com/css?family=Poppins:300,400,500,600,700";


body {
    font-family: 'Poppins', sans-serif;
    background: #fafafa;
}

p {
    font-family: 'Poppins', sans-serif;
    font-size: 1.1em;
    font-weight: 300;
    line-height: 1.7em;
    color: #999;
}

a, a:hover, a:focus {
    color: inherit;
    text-decoration: none;
    transition: all 0.3s;
}

.navbar {
    padding: 15px 10px;
    background: #fff;
    border: none;
    border-radius: 0;
    margin-bottom: 40px;
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
}

.navbar-btn {
    box-shadow: none;
    outline: none !important;
    border: none;
}

.line {
    width: 100%;
    height: 1px;
    border-bottom: 1px dashed #ddd;
    margin: 40px 0;
}

/* ---------------------------------------------------
    SIDEBAR STYLE
----------------------------------------------------- */
.wrapper {
    display: flex;
    align-items: stretch;
    perspective: 1500px;
}

#sidebar {
    min-width: 250px;
    max-width: 250px;
    background: #7386D5;
    color: #fff;
    transition: all 0.6s cubic-bezier(0.945, 0.020, 0.270, 0.665);
    transform-origin: bottom left;
}

#sidebar.active {
    margin-left: -250px;
    transform: rotateY(100deg);
}

#sidebar .sidebar-header {
    padding: 20px;
    background: #6d7fcc;
}

#sidebar ul.components {
    padding: 20px 0;
    border-bottom: 1px solid #47748b;
}

#sidebar ul p {
    color: #fff;
    padding: 10px;
}

#sidebar ul li a {
    padding: 10px;
    font-size: 1.1em;
    display: block;
}
#sidebar ul li a:hover {
    color: #7386D5;
    background: #fff;
}

#sidebar ul li.active > a, a[aria-expanded="true"] {
    color: #fff;
    background: #6d7fcc;
}


a[data-toggle="collapse"] {
    position: relative;
}

a[aria-expanded="false"]::before, a[aria-expanded="true"]::before {
    content: '\e259';
    display: block;
    position: absolute;
    right: 20px;
    font-family: 'Glyphicons Halflings';
    font-size: 0.6em;
}
a[aria-expanded="true"]::before {
    content: '\e260';
}


ul ul a {
    font-size: 0.9em !important;
    padding-left: 30px !important;
    background: #6d7fcc;
}

ul.CTAs {
    padding: 20px;
}

ul.CTAs a {
    text-align: center;
    font-size: 0.9em !important;
    display: block;
    border-radius: 5px;
    margin-bottom: 5px;
}

a.download {
    background: #fff;
    color: #7386D5;
}

a.article, a.article:hover {
    background: #6d7fcc !important;
    color: #fff !important;
}



/* ---------------------------------------------------
    CONTENT STYLE
----------------------------------------------------- */
#content {
    padding: 20px;
    min-height: 100vh;
    transition: all 0.3s;
}

#sidebarCollapse {
    width: 40px;
    height: 40px;
    background: #f5f5f5;
}

#sidebarCollapse span {
    width: 80%;
    height: 2px;
    margin: 0 auto;
    display: block;
    background: #555;
    transition: all 0.8s cubic-bezier(0.810, -0.330, 0.345, 1.375);
    transition-delay: 0.2s;
}

#sidebarCollapse span:first-of-type {
    transform: rotate(45deg) translate(2px, 2px);
}
#sidebarCollapse span:nth-of-type(2) {
    opacity: 0;
}
#sidebarCollapse span:last-of-type {
    transform: rotate(-45deg) translate(1px, -1px);
}


#sidebarCollapse.active span {
    transform: none;
    opacity: 1;
    margin: 5px auto;
}


/* ---------------------------------------------------
    MEDIAQUERIES
----------------------------------------------------- */
@media (max-width: 768px) {
    #sidebar {
        margin-left: -250px;
        transform: rotateY(90deg);
    }
    #sidebar.active {
        margin-left: 0;
        transform: none;
    }
    #sidebarCollapse span:first-of-type,
    #sidebarCollapse span:nth-of-type(2),
    #sidebarCollapse span:last-of-type {
        transform: none;
        opacity: 1;
        margin: 5px auto;
    }
    #sidebarCollapse.active span {
        margin: 0 auto;
    }
    #sidebarCollapse.active span:first-of-type {
        transform: rotate(45deg) translate(2px, 2px);
    }
    #sidebarCollapse.active span:nth-of-type(2) {
        opacity: 0;
    }
    #sidebarCollapse.active span:last-of-type {
        transform: rotate(-45deg) translate(1px, -1px);
    }

}
!

JS 

              
                $(document).ready(function() {
  $("#sidebarCollapse").on("click", function() {
    $("#sidebar").toggleClass("active");
    $(this).toggleClass("active");
  });
});
!
999px

Console