<input type="checkbox" id="nav-control" class="nav-control" ><label for="nav-control" class="toggle-button">
    <a class="wolverine">
      <div class="claws"></div>
    </a>
</label>

<nav class="navigation">
  <ul>
    <li>
      <a href="#">Link</a>
    </li>
    <li>
      <a href="">Link</a>
    </li>
    <li>
      <a href="">Link</a>
    </li>
    <li>
      <a href="">Link</a>
    </li>
  </ul>

</nav>

<div class="site-wrap">
<div class="callout">
</div>
  <section>
    <article>
      <h1>Title</h1>
    </article>

    <article>
      <h1>Title</h1>
    </article>

    <article>
      <h1>Title</h1>
    </article>

    <article>
      <h1>Title</h1>
    </article>

    <article>
      <h1>Title</h1>
    </article>

  </section>
</div>

html, body {
  color: #ffffff;
  margin: 0;
  padding: 0;
  height: 100%;
  background: rgba(255, 255, 255, 1.0);
  font-family: Arial, sans-serif;
}

html {
  box-sizing: border-box;
}

body {
  overflow-x: hidden;
}

*, *:before, *:after {
  box-sizing: inherit;
}

.navigation {
  width: 100%;
  height: 100%;
  position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
  z-index: 0;
  list-style: none;
  background: #111;
  
  ul {
    padding: 0;
    margin: 0;
    
    li {
      position: relative;
      width: 200px;
      list-style: none;
      opacity: 0;
      -webkit-transform: translateX( -70% );
      -moz-transform: translateX( -70% );
      -ms-transform: translateX( -70% );
      -o-transform: translateX( -70% );
      transform: translateX( -70% );
      -webkit-transition: all 300ms ease-in-out;
      -moz-transition: all 300ms ease-in-out;
      -ms-transition: all 300ms ease-in-out;
      -o-transition: all 300ms ease-in-out;
      transition: all 300ms ease-in-out;
      
      a {
        display: block;
        padding: 19px;
        color: #ffffff;
        font-size: 20px;
        text-decoration: none;
        transition: color 0.2s, background 0.5s;
        
        &:hover {
          background: rgba(255, 255, 255, .1)
        }
      }
    }
  }
}

.site-wrap {
  height: 100%;
  width: 100%;
  background-color: #ffffff;
  position: relative;
    top: 0;
    bottom: 100%;
    left: 0;
  z-index: 1;
  padding: 0;
  background: #ffffff
}

.nav-control {
  position: absolute;
  width: 100%;
  clip: rect(0, 0, 0, 0);
}

label[for="nav-control"] {
  position: fixed;
    left: 15px; 
    top: 15px;
  z-index: 2;
  text-rendering: auto;
  -webkit-font-smoothing: antialiased;
  cursor: pointer;
  background-size: contain;
}

.callout {
  position: absolute;
    left: 0;
    top: 0;
  background: rgba(255, 255, 255, .15);
  width: 100%;
  height: 61px;
  padding: 10px 60px;
  text-align: center;
  z-index: 2;
}

.nav-control + label, .site-wrap {
  transition: left 0.2s;
}

.nav-control:checked + label {
  left: 215px;
}

.nav-control:checked ~ .navigation ul li {
  opacity: 1;
  -webkit-transform: translateX( 0 );
  -moz-transform: translateX( 0 );
  -ms-transform: translateX( 0 );
  -o-transform: translateX( 0 );
  transform: translateX( 0 );
}

.nav-control:checked ~ .site-wrap {
  left: 200px;
  box-shadow: 0 0 5px 5px rgba(0,0,0,0.5);
}

section {
  width: 100%;
  height: 100%;
  float:left;
  
  &:hover article {
    width: 15%;
  }
  
  article {
    cursor: pointer;
    width: 20%;
    height: 100%;
    padding: 7% 20px 10%;
    display: inline-block;
    float:left;
    position: relative;
    text-align: center;
    -moz-transition: all 250ms ease-in-out ;
    -o-transition: all 250ms ease-in-out;
    transition: all 250ms ease-in-out;
    
    &:hover {
      width: 40%;
      -moz-transition: all 250ms ease-in-out;
      -o-transition: all 250ms ease-in-out;
      transition: all 250ms ease-in-out;
      opacity: 1;
      
      &:before {
        opacity: 1;
      }
      
      > h1 {
        opacity: 1;
      }
    }
    
    &:before {
      content: " ";
      position: absolute;
        top: 0;
        left: 0;
      height: 100%;
      width: 100%;
      opacity: 0;
      background: -moz-radial-gradient(center, ellipse cover, rgba(255,255,255,0.3) 0%, rgba(255,255,255,0) 100%); /* FF3.6+ */
      background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%,rgba(255,255,255,0.3)), color-stop(100%,rgba(255,255,255,0))); /* Chrome,Safari4+ */
      background: -webkit-radial-gradient(center, ellipse cover, rgba(255,255,255,0.3) 0%,rgba(255,255,255,0) 100%); /* Chrome10+,Safari5.1+ */
      background: -o-radial-gradient(center, ellipse cover, rgba(255,255,255,0.3) 0%,rgba(255,255,255,0) 100%); /* Opera 12+ */
      background: -ms-radial-gradient(center, ellipse cover, rgba(255,255,255,0.3) 0%,rgba(255,255,255,0) 100%); /* IE10+ */
      background: radial-gradient(ellipse at center, rgba(255,255,255,0.3) 0%,rgba(255,255,255,0) 100%); /* W3C */
      filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#4dffffff', endColorstr='#00ffffff',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */
      -moz-transition: all 250ms ease-in-out;
      -o-transition: all 250ms ease-in-out;
      transition: all 250ms ease-in-out;
      z-index: 1
    }
    
    &:nth-child(1) {
      background: #f2b635;
    }
    
    &:nth-child(2){
      background: #f19a2a;
    }
    
    &:nth-child(3){
      background: #00caff;
    }
    
    &:nth-child(4){
      background: #00a0e6;
    }
    
    &:nth-child(5){
      background: #f25648;
    }
    
    h1 {
      font-size: 50px;
      margin:0 0 40px;
      opacity: 0;
      -moz-transition: all 250ms ease-in-out ;
      -o-transition: all 250ms ease-in-out;
      transition: all 250ms ease-in-out;
      position: relative;
      z-index: 2;
    }
    
    > h1:after {
      content: "Here is a sub menu";
      font-size: 12px;
      text-align: center;
      position: absolute;
        bottom: -15px;
        left: 0;
      text-transform: uppercase;
      width: 100%;
    }
    
    h2 {
      font-size: 12px;
      text-transform: uppercase;
      z-index: 2;
    }
    
    footer {
      width: 100%;
      position: absolute;
        bottom: 0;
        left: 0;
      padding: 0;
      
      h3{
        color: #ffffff;
        font-size: 12px;
        text-transform: uppercase;
      }
    }
  }
}


@media screen and (max-width: 979px) {
  
  section article, section article:hover, section:hover article {
    width:100%;
    display: block;
    height: auto;
    opacity: 1;
  }
  
  section article h1 {
    margin: 50px 0 50px;
    opacity: 1;
  }
  
  section article footer {
    position: static;
  }
  
}

.toggle-button {
  display: block;
  width: 20px;
  position: relative;

  .wolverine {
    display: inline-block;
    padding: 15px 0px;
    cursor: pointer;
    -webkit-user-select: none;
    opacity: .97;
    -webkit-transition: all .3s ease;
    -moz-transition: all .3s ease;
    -o-transition: all .3s ease;
    transition: all .3s ease;
     
    .claws {
      position: relative;
      width: 20px;
      height: 4px;
      background: rgb(255,255,255);

      &:before, &:after {
        display: block;
        content: "";
        height: 4px;
        width: 20px;
        background: rgb(255, 255, 255);
        position: absolute;
        z-index: -1;
        -webkit-transform-origin: 50% 50%;
        transform-origin: 50% 50%;
        -webkit-transition: top .1s .2s,-webkit-transform .2s ease;
        -webkit-transition-delay: ease,0s;
        -moz-transition: top .1s .2s ease,-moz-transform .2s ease;
        -o-transition: top .1s .2s ease,-o-transform .2s ease;
        transition: top .1s .2s ease,transform .2s ease;
      }  

      &:before {
        top: 8px;
      }

      &:after {
        top: -8px;
      }
    }
    
    &.close {

       .claws {
        -webkit-transition: background .1s 0s;
        -webkit-transition-delay: ease;
        -moz-transition: background .1s 0s ease;
        -o-transition: background .1s 0s ease;
        transition: background .1s 0s ease;
        background: transparent!important;

        &:before, &:after {
            background: rgb(255,255,255);
          -webkit-transition: top .1s ease,-webkit-transform .1s .2s;
          -webkit-transition-delay: 0s,ease;
          -moz-transition: top .1s ease,-moz-transform .1s .2s ease;
          -o-transition: top .1s ease,-o-transform .1s .2s ease;
          transition: top .1s ease,transform .1s .2s ease;
          top: 0;
          width: 20px;
        }

        &:before {
          -webkit-transform: rotate3d(0,0,1,45deg);
          transform: rotate3d(0,0,1,45deg);
        }

        &:after {
          -webkit-transform: rotate3d(0,0,1,-45deg);
          transform: rotate3d(0,0,1,-45deg);
        }
      }
     }
  }
}

.nav-control:checked ~ .toggle-button {

  .wolverine {
     
    .claws {
      -webkit-transition: background .1s 0s;
      -webkit-transition-delay: ease;
      -moz-transition: background .1s 0s ease;
      -o-transition: background .1s 0s ease;
      transition: background .1s 0s ease;
      background: transparent!important;

      &:before, &:after {
        background: rgb(255,255,255);
        -webkit-transition: top .1s ease,-webkit-transform .1s .2s;
        -webkit-transition-delay: 0s,ease;
        -moz-transition: top .1s ease,-moz-transform .1s .2s ease;
        -o-transition: top .1s ease,-o-transform .1s .2s ease;
        transition: top .1s ease,transform .1s .2s ease;
        top: 0;
        width: 20px;
      }

      &:before {
        -webkit-transform: rotate3d(0,0,1,45deg);
        transform: rotate3d(0,0,1,45deg);
      }

      &:after {
        -webkit-transform: rotate3d(0,0,1,-45deg);
        transform: rotate3d(0,0,1,-45deg);
      }
    }  
  }
}