A HTML5, CSS3 and JavaScript demo

<title>CSS buttons dropdown</title>
<div id="centeredmenu">
   <ul>
      <li><a href="#">2014</a>
         <ul>
            <li><a href="#">Link one</a></li>
            <li><a href="#">Link two</a></li>
            <li><a href="#">Link three</a></li>
            <li><a href="#">Link four</a></li>
            <li><a href="#">Link five</a></li>
         </ul>
      </li>
      <li class="archive"><a href="#">2013</a>
         <ul>
            <li><a href="#">Link one</a></li>
            <li><a href="#">Link two</a></li>
            <li><a href="#">Link three</a></li>
            <li><a href="#">Link four</a></li>
            <li><a href="#">Link five is a long link that wraps</a></li>
         </ul>
      </li>
      <li><a href="#">2012</a>
         <ul>
            <li><a href="#">Link one</a></li>
            <li><a href="#">Link two</a></li>
            <li><a href="#">Link three</a></li>
            <li><a href="#">Link four</a></li>
            <li><a href="#">Link five</a></li>
         </ul>
      </li>
      <li><a href="#">2011</a>
         <ul class="last">
            <li><a href="#">Link one</a></li>
            <li><a href="#">Link two</a></li>
            <li><a href="#">Link three</a></li>
            <li><a href="#">Link four</a></li>
            <li><a href="#">Link five</a></li>
         </ul>
      </li>
       <li><a href="#">2011</a>
         <ul class="last">
            <li><a href="#">Link one</a></li>
            <li><a href="#">Link two</a></li>
            <li><a href="#">Link three</a></li>
            <li><a href="#">Link four</a></li>
            <li><a href="#">Link five</a></li>
         </ul>
      </li>
       <li><a href="#">2011</a>
         <ul class="last">
            <li><a href="#">Link one</a></li>
            <li><a href="#">Link two</a></li>
            <li><a href="#">Link three</a></li>
            <li><a href="#">Link four</a></li>
            <li><a href="#">Link five</a></li>
         </ul>
      </li>
       <li><a href="#">2011</a>
         <ul class="last">
            <li><a href="#">Link one</a></li>
            <li><a href="#">Link two</a></li>
            <li><a href="#">Link three</a></li>
            <li><a href="#">Link four</a></li>
            <li><a href="#">Link five</a></li>
         </ul>
      </li>
       <li><a href="#">2011</a>
         <ul class="last">
            <li><a href="#">Link one</a></li>
            <li><a href="#">Link two</a></li>
            <li><a href="#">Link three</a></li>
            <li><a href="#">Link four</a></li>
            <li><a href="#">Link five</a></li>
         </ul>
      </li>
       <li><a href="#">2011</a>
         <ul class="last">
            <li><a href="#">Link one</a></li>
            <li><a href="#">Link two</a></li>
            <li><a href="#">Link three</a></li>
            <li><a href="#">Link four</a></li>
            <li><a href="#">Link five</a></li>
         </ul>
      </li>
       <li><a href="#">2011</a>
         <ul class="last">
            <li><a href="#">Link one</a></li>
            <li><a href="#">Link two</a></li>
            <li><a href="#">Link three</a></li>
            <li><a href="#">Link four</a></li>
            <li><a href="#">Link five</a></li>
         </ul>
      </li>
       <li><a href="#">2011</a>
         <ul class="last">
            <li><a href="#">Link one</a></li>
            <li><a href="#">Link two</a></li>
            <li><a href="#">Link three</a></li>
            <li><a href="#">Link four</a></li>
            <li><a href="#">Link five</a></li>
         </ul>
      </li>
   </ul>
</div>

/* Main menu settings */
#centeredmenu {
   clear:both;
   float:left;
   margin:0;
   padding:0;
   border-bottom:1px solid #000; /* black line below menu */
   width:100%;
   font-family:Verdana, Geneva, sans-serif; /* Menu font */
   font-size:90%; /* Menu text size */
   z-index:1000; /* This makes the dropdown menus appear above the page content below */
   position:relative;
}

/* Top menu items */
#centeredmenu ul {
   margin:0;
   padding:0;
   list-style:none;
   float:right;
   position:relative;
   right:50%;
}
#centeredmenu ul li {
   margin:0 0 0 1px;
   padding:0;
   float:left;
   position:relative;
   left:50%;
   top:1px;

}
#centeredmenu ul li a {
    z-index: 999;
   display:block;
   margin:0;
   padding:.6em .5em .4em;
   font-size:1em;
   line-height:1em;
   background:#ddd;
   text-decoration:none;
   color:#444;
   font-weight:bold;
   border-bottom:1px solid #000;
}
#centeredmenu ul li.active a {
   color:#fff;
   background:#000;
}
#centeredmenu ul li a:hover {
   background:#36f; /* Top menu items background colour */
   color:#fff;
   border-bottom:1px solid #03f;
}
#centeredmenu ul li:hover a,
#centeredmenu ul li.hover a { /* This line is required for IE 6 and below */
   background:#36f; /* Top menu items background colour */
   color:#fff;
   border-bottom:1px solid #03f;
}

/* Submenu items */
#centeredmenu ul ul {
   display:none; /* Sub menus are hiden by default */
   position:absolute;
   top:2em;
   left:0;
   right:auto; /*resets the right:50% on the parent ul */
   width:10em; /* width of the drop-down menus */
}
#centeredmenu ul ul li {
   left:auto;  /*resets the left:50% on the parent li */
   margin:0; /* Reset the 1px margin from the top menu */
   clear:left;
   width:100%;
}
#centeredmenu ul ul li a,
#centeredmenu ul li.active li a,
#centeredmenu ul li:hover ul li a,
#centeredmenu ul li.hover ul li a { /* This line is required for IE 6 and below */
   font-size:.8em;
   font-weight:normal; /* resets the bold set for the top level menu items */
   background:#eee;
   color:#444;
   line-height:1.4em; /* overwrite line-height value from top menu */
   border-bottom:1px solid #ddd; /* sub menu item horizontal lines */
}
#centeredmenu ul ul li a:hover,
#centeredmenu ul li.active ul li a:hover,
#centeredmenu ul li:hover ul li a:hover,
#centeredmenu ul li.hover ul li a:hover { /* This line is required for IE 6 and below */
   background:#36f; /* Sub menu items background colour */
   color:#fff;
}

/* Flip the last submenu so it stays within the page */
#centeredmenu ul ul.last {
   left:auto; /* reset left:0; value */
   right:0; /* Set right value instead */
}

/* Make the sub menus appear on hover */
#centeredmenu ul li:hover ul,
#centeredmenu ul li.hover ul { /* This line is required for IE 6 and below */
   display:block; /* Show the sub menus */
}

#archive {
        margin: 30px 0 50px 0;
			font-family: 'Oswald';
			font-weight: 700;
    }
    
    #archive .wrapper {
        display: vertical-block;
        width: 180px;
        margin: 20px 10px 0 0;
        height: 20px;
        position: relative;
    }
    
    #archive .parent {
        height: 100%;
        width: 100%;
        display: block;
        cursor: pointer;
        line-height: 30px;
        height: 30px;
        border-radius: 5px;
        background: #D2383C;
  opacity: 0.9;
        border: 1px solid #AAA;
        border-bottom: 1px solid #777;
        color: #fff;
        font-weight: bold;
        z-index: 2;
        position: relative;
        -webkit-transition: border-radius .1s linear, background .1s linear, z-index 0s linear;
        -webkit-transition-delay: .2s;
        text-align: center;
    }
    
    #archive .parent:hover,
    #archive .content:hover ~ .parent {
        background: #D2383C;
  opacity:  1;
        -webkit-transition-delay: 0s, 0s, 0s;
    }
    
    #archive .content:hover ~ .parent {
        border-bottom-left-radius: 0;
        border-bottom-right-radius: 0;
        z-index: 1;
    }
    
    #archive .content {
        position: absolute;
        top: 0;
        display: block;
        z-index: 1;
        height: 0;
        width: 180px;
        padding-top: 30px;
        -webkit-transition: height 0.6s ease;
        -webkit-transition-delay: 0s;
        border: 1px solid #777;
        border-radius: 0px;
        box-shadow: 0 1px 2px rgba(0,0,0,.4);
    }
    
    #archive .wrapper:active .content {
        height: 123px;
        z-index: 10;
        -webkit-transition-delay: 0s;
    }
    
    #archive .content:hover {
        height: 253px;
        z-index: 3;
        -webkit-transition-delay: 0s;
    }
    
    
    #archive .content ul {
        background: #fff;
        margin: 0;
        padding: 0;
        overflow: hidden;
        height: 100%;
        border-bottom-left-radius: 0px;
        border-bottom-right-radius: 0px;
    }
    
    #archive .content ul a {
        text-decoration: none;
    }
    
    #archive .content li:hover {
        background: #dddddd;
        color: #D2383C;
    }
    
    #archive .content li {
        list-style: none;
        text-align: left;
        color: #888;
        font-size: 14px;
        line-height: 30px;
        height: 30px;
        padding-left: 10px;
        border-top: 1px solid #dddddd;
    }
    
    #archive .content li:last-of-type {
        border-bottom-left-radius: 0px;
        border-bottom-right-radius: 0px;
    }