On websites that do not want to use JavaScript code, they can use this code for their website menu element. This menu, in addition to doing the menu work for us, can have several sub-menu levels. The menu itself has a white background. Clicking the toggle button at the top left of the screen will display this menu.


HTML
<!-- This script got from www.devanswer.com  -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/prefixfree/1.0.7/prefixfree.min.js"></script>
<div id="wrapper">
    <div id="info">
        <div id="info-content">
            <h1>Multi level <strong>CSS-only push menu</strong></h1>
            <p>&lt;noscript&gt;No javascript required&lt;/noscript&gt;</p>
        </div>
    </div>
    <input type="checkbox" id="menu" name="menu" class="menu-checkbox">
    <div class="menu">
        <label class="menu-toggle" for="menu"><span>Toggle</span></label>
        <ul>
            <li>
                <a href="#">Menu-1</a>
            </li>
            <li>
                <a href="#">Menu-2</a>
            </li>
            <li>
                <label for="menu-3">Menu-3</label>
                <input type="checkbox" id="menu-3" name="menu-3" class="menu-checkbox">
                <div class="menu">
                    <label class="menu-toggle" for="menu-3"><span>Toggle</span></label>
                    <ul>
                        <li>
                            <a href="#">Menu-3-1</a>
                        </li>
                        <li>
                            <label for="menu-3-2">Menu-3-2</label>
                            <input type="checkbox" id="menu-3-2" name="menu-3-2" class="menu-checkbox">
                            <div class="menu">
                                <label class="menu-toggle" for="menu-3-2"><span>Toggle</span></label>
                                <ul>
                                    <li>
                                        <a href="#">Menu-3-2-1</a>
                                    </li>
                                    <li>
                                        <a href="#">Menu-3-2-2</a>
                                    </li>
                                    <li>
                                        <label for="menu-3-2-3">Menu-3-2-3</label>
                                        <input type="checkbox" id="menu-3-2-3" name="menu-3-2-3" class="menu-checkbox">
                                        <div class="menu">
                                            <label class="menu-toggle" for="menu-3-2-3"><span>Toggle</span></label>
                                            <ul>
                                                <li>
                                                    <a href="#">Menu-3-2-3-1</a>
                                                </li>
                                                <li>
                                                    <a href="#">Menu-3-2-3-2</a>
                                                </li>
                                                <li>
                                                    <a href="#">Menu-3-2-3-3</a>
                                                </li>
                                                <li>
                                                    <a href="#">Menu-3-2-3-4</a>
                                                </li>
                                            </ul>
                                        </div>
                                    </li>
                                    <li>
                                        <a href="#">Menu-3-2-4</a>
                                    </li>
                                </ul>
                            </div>
                        </li>
                        <li>
                            <a href="#">Menu-3-3</a>
                        </li>
                        <li>
                            <a href="#">Menu-3-4</a>
                        </li>
                    </ul>
                </div>
            </li>
            <li>
                <label for="menu-4">Menu-4</label>
                <input type="checkbox" id="menu-4" name="menu-4" class="menu-checkbox">
                <div class="menu">
                    <label class="menu-toggle" for="menu-4"><span>Toggle</span></label>
                    <ul>
                        <li>
                            <a href="#">Menu-4-1</a>
                        </li>
                        <li>
                            <a href="#">Menu-4-2</a>
                        </li>
                        <li>
                            <a href="#">Menu-4-3</a>
                        </li>
                        <li>
                            <a href="#">Menu-4-4</a>
                        </li>
                    </ul>
                </div>
            </li>
            <li>
                <label for="menu-5">Menu-5</label>
                <input type="checkbox" id="menu-5" name="menu-5" class="menu-checkbox">
                <div class="menu">
                    <label class="menu-toggle" for="menu-5"><span>Toggle</span></label>
                    <ul>
                        <li>
                            <a href="#">Menu-5-1</a>
                        </li>
                        <li>
                            <a href="#">Menu-5-2</a>
                        </li>
                        <li>
                            <a href="#">Menu-5-3</a>
                        </li>
                        <li>
                            <a href="#">Menu-5-4</a>
                        </li>
                    </ul>
                </div>
            </li>
            <li>
                <a href="#">Menu-6</a>
            </li>
        </ul>
    </div>
</div><div id="bcl"><a style="font-size:8pt;text-decoration:none;" href="http://www.devanswer.com ">Developers Answer</a></div>
                        

CSS
/* reset */
* {
  margin: 0;
  padding: 0;
}
#wrapper {
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;
}
label {
  cursor: pointer;
}
label:focus {
  outline: none;
}
.menu {
  position: absolute;
  top: 0;
  left: 0;
  background: #fff;
  width: 240px;
  height: 100%;
  transform: translate3d(-240px, 0, 0);
  transition: transform 0.35s;
}
.menu label.menu-toggle {
  position: absolute;
  right: -60px;
  width: 60px;
  height: 60px;
  line-height: 0px;
  display: block;
  padding: 0;
  text-indent: -9999px;
  background: #fff url(https://cdn4.iconfinder.com/data/icons/wirecons-free-vector-icons/32/menu-alt-512.png) 50% 50%/25px 25px no-repeat;
}
.menu ul li > label {
  background: url(https://cdn4.iconfinder.com/data/icons/ionicons/512/icon-arrow-right-b-128.png) 95% 50%/16px 16px no-repeat;
}
.menu ul li a, .menu ul li label {
  display: block;
  text-align: center;
  padding: 0 20px;
  line-height: 60px;
  text-decoration: none;
  color: #000;
}
.menu ul li a:hover, .menu ul li label:hover {
  color: #666;
}
/* hide inputs */          
.menu-checkbox {
  display: none;
}
/* hide navigation icon for sublabels */    
.menu .menu label.menu-toggle {
  background: none;
}

/* fade in checked menu */    
.menu-checkbox:checked + .menu {
  transform: translate3d(0, 0, 0);
}
/* for show */
html, body {
  height: 100%;
}
body {
  background: url(http://www.devanswer.com/img/tumblr.jpg) 50% 50%/cover;
}
p {
  margin-bottom: 15px;
}
#info {
  display: table;
  background: rgba(0, 0, 0, 0.4);
  height: 100%;
  width: 100%;
}
#info #info-content {
  display: table-cell;
  vertical-align: middle;
  text-align: center;
  text-transform: uppercase;
  color: #fff;
  font-size: 12px;
}
#info #info-content h1 {
  color: #fff;
  border: 3px solid #fff;
  text-align: center;
  background: rgba(0, 0, 0, 0.1);
  font-size: 22px;
  font-weight: normal;
  padding: 20px;
  margin: 10px;
  display: inline-block;
}
#info #info-content h1 strong {
  display: block;
  font-size: 26px;
}