<section>
  <h2>CSS only Sliding menu (Hamburger menu)</h2>
  <h2>Demo:</h2>
    <span class="container">
      <span class="checkbox-container">
        <input class="checkbox-trigger" type="checkbox"  />
        <span class="menu-content">
            <ul>
              <li>Home</li>
              <li>About</li>
              <li>Contact</li>
            </ul>
          <span class="hamburger-menu"></span>
        </span>
      </span>
    </span>
  <h2>Compatibility:</h2>
  <p>firefox and chrome that support css3.</p>
  <p>internet explorer: edge as far as i know</p>
</section>
<span id="footer">Created by Maxime Huylebroeck (G_4s) </br> hit me up on twitter i'm <a href="https://twitter.com/TheRealG_4s">@TheRealG_4s</a></span>

/**
┌─┐┌─┐┌─┐┌─┐  ┌┬┐┌─┐┌─┐┬┌─┐┌┐┌
├─┘├─┤│ ┬├┤    ││├┤ └─┐││ ┬│││
┴  ┴ ┴└─┘└─┘  ─┴┘└─┘└─┘┴└─┘┘└┘
**/
html {
  height: 100%;
}

body {
  background-color: #6D8EA0;     /** FUNCTIONAL CSS MORE DOWN**/
  height: 100%;
  font-family: 'Delius Unicase', cursive;
  text-align: center;
  color: #45565E;
}

.container {
  display: block;
  width: 350px;
  height: 182px;
  margin: 0 auto;
  background: #4C6370;
  overflow: hidden;
}

section {
  display: inline-block;
  width: 100%;
}

a {
  color: #40798C;
  background-color: #0B2027;
  padding: 0.3em;
  border-radius: 5px;
  text-decoration: none;
}

/**
┌─┐┌─┐┌─┐  ┬ ┬┌─┐┌┬┐┌┐ ┬ ┬┬─┐┌─┐┌─┐┬─┐  ┌┬┐┌─┐┌┐┌┬ ┬
│  └─┐└─┐  ├─┤├─┤│││├┴┐│ │├┬┘│ ┬├┤ ├┬┘  │││├┤ ││││ │
└─┘└─┘└─┘  ┴ ┴┴ ┴┴ ┴└─┘└─┘┴└─└─┘└─┘┴└─  ┴ ┴└─┘┘└┘└─┘
**/
/** always use classes and id's,[Type=checkbox] is slow css **/

.checkbox-container {
  display: block;
  float: left;
  width: 50px;
  height: 50px;
  position: relative;
  background: #182825;
}

.checkbox-trigger {
  opacity: 0;
  position: absolute;
  width: 50px;
  height: 50px;
  left: 0px;
  cursor: pointer;
  z-index: 5;
}

.hamburger-menu, .hamburger-menu::before, .hamburger-menu::after {
    display: block;
    position: absolute;
    background: white;
    width: 40px;
    height: 4px;
    margin: 1.3em 3em;
    transition: background 0.3s;
}

.hamburger-menu::before, .hamburger-menu::after {
    content: '';
    position: absolute;
    margin: -0.7em 0 0;
    transition: width 0.7s ease 0.3s, transform 0.7s ease 0.3s;
}

.hamburger-menu::after {
   margin-top: 0.7em; 
}

.hamburger-menu {
  position: relative;
  display: block;
  margin: 0;
  margin-top: 1.45em;
  margin-right: 0.35em;
  margin-left: 0.35em;
  margin-bottom: 1.45em;
  transition: width 0.3s ease;
}

.checkbox-trigger:checked {
  left: 202px;
}

.checkbox-trigger:checked + .menu-content .hamburger-menu {
  width: 2em;
  
  transition: width 0.7s ease 0.7s;
}

.checkbox-trigger:checked + .menu-content .hamburger-menu::before {
  width: 1.2em;
  transform: rotate(-35deg);
  margin-top: -0.4em;
}

.checkbox-trigger:checked + .menu-content .hamburger-menu::after {
  width: 1.2em;
  transform: rotate(35deg);
  margin-top: 0.4em;
}

.checkbox-trigger:checked + .menu-content ul {
  width: 200px;
  height: 200px;
  transition: width 0.7s ease 0.3s, height 0.3s ease;
}

.menu-content {
  display: flex;
  background: #182825;
  color: white;
  float: left;
}

.menu-content ul {
  display: block;
  padding-left: 0;
  padding-top: 1em;
  padding-bottom: 1em;
  margin: 0;
  width: 0px;
  height: 0px;
  overflow: hidden;
  transition: height 0.3s ease 0.7s, width 0.7s ease;
}

.menu-content ul li {
  list-style: none;
  padding-top: 1em;
  padding-bottom: 1em;
  cursor: pointer;
  transition: color 0.5s, background 0.5s;
}

.menu-content ul li:hover {
  color: #0CD6AD;
  background: #1E332F;
}

/**
┌─┐┌─┐┌─┐┌┬┐┌─┐┬─┐
├┤ │ ││ │ │ ├┤ ├┬┘
└  └─┘└─┘ ┴ └─┘┴└─
**/
                                         /** footer **/
#footer {
  line-height: 2em;
  font-size: 0.9em;
  display: inline-block;
  min-width: 2em;
  margin: 0 auto;
}