Меню как на YouTube

<nav id="dr-menu" class="dr-menu">  
   <div class="dr-trigger"><span class="dr-icon dr-icon-menu"></span><a class="dr-label">Account</a></div>  
   <ul>  
   <li><a class="dr-icon dr-icon-user" href="#">Xavier Densmore</a></li>  
   <li><a class="dr-icon dr-icon-camera" href="#">Videos</a></li>  
   <li><a class="dr-icon dr-icon-heart" href="#">Favorites</a></li>  
   <li><a class="dr-icon dr-icon-bullhorn" href="#">Subscriptions</a></li>  
   <li><a class="dr-icon dr-icon-download" href="#">Downloads</a></li>  
   <li><a class="dr-icon dr-icon-settings" href="#">Settings</a></li>  
   <li><a class="dr-icon dr-icon-switch" href="#">Logout</a></li>  
   </ul>  
</nav>

@font-face {  
   font-family: 'icomoon';  
   src:url('../fonts/icomoon.eot');  
   src:url('../fonts/icomoon.eot?#iefix') format('embedded-opentype'),  
   url('../fonts/icomoon.woff') format('woff'),  
   url('../fonts/icomoon.ttf') format('truetype'),  
   url('../fonts/icomoon.svg#icomoon') format('svg');  
   font-weight: normal;  
   font-style: normal;  
}
.dr-menu {  
   width: 100%;  
   max-width: 400px;  
   min-width: 300px;  
   position: relative;  
   font-size: 1.3em;  
   line-height: 2.5;  
   font-weight: 400;  
   color: #fff;  
   padding-top: 2em;  
}
.dr-menu > div {  
   cursor: pointer;  
   position: absolute;  
   width: 100%;  
   z-index: 100;  
}
.dr-menu > div .dr-icon {  
   top: 0;  
   left: 0;  
   position: absolute;  
   font-size: 150%;  
   line-height: 1.6;  
   padding: 0 10px;  
   transition: all 0.4s ease;  
}
.dr-menu.dr-menu-open > div .dr-icon {  
   color: #60a773;  
   left: 100%;  
   transform: translateX(-100%);  
}
.dr-menu > div .dr-icon:after {  
   content: "\e008";  
   position: absolute;  
   font-size: 50%;  
   line-height: 3.25;  
   left: -10%;  
   opacity: 0;  
}
.dr-menu.dr-menu-open > div .dr-icon:after {  
   opacity: 1;  
}
.dr-menu > div .dr-label {  
   padding-left: 3em;  
   position: relative;  
   display: block;  
   color: #60a773;  
   font-size: 0.9em;  
   font-weight: 700;  
   letter-spacing: 1px;  
   text-transform: uppercase;  
   line-height: 2.75;  
   transition: all 0.2s ease-in;  
}  

.dr-menu.dr-menu-open > div .dr-label {  
   transform: translateY(-90%);  
}
.dr-menu ul {  
   padding: 0;  
   margin: 0 3em 0 0;  
   list-style: none;  
   opacity: 0;  
   position: relative;  
   z-index: 0;  
   pointer-events: none;  
   transition: opacity 0s linear 205ms;  
}
.dr-menu.dr-menu-open ul {  
   opacity: 1;  
   z-index: 200;  
   pointer-events: auto;  
   transition: opacity 0s linear 0s;  
}

.dr-menu ul li {  
   display: block;  
   margin: 0 0 5px 0;  
   opacity: 0;  
   transition: opacity 0.3s ease;  
}  

.dr-menu.dr-menu-open ul li {  
   opacity: 1;  
}

.dr-menu.dr-menu-open ul li:nth-child(2) {  
   transition-delay: 35ms;  
}  

.dr-menu.dr-menu-open ul li:nth-child(3) {  
   transition-delay: 70ms;  
}  

.dr-menu.dr-menu-open ul li:nth-child(4) {  
   transition-delay: 105ms;  
}  

.dr-menu.dr-menu-open ul li:nth-child(5) {  
   transition-delay: 140ms;  
}  

.dr-menu.dr-menu-open ul li:nth-child(6) {  
   transition-delay: 175ms;  
}  

.dr-menu.dr-menu-open ul li:nth-child(7) {  
   transition-delay: 205ms;  
}

.dr-menu ul li a {  
   display: inline-block;  
   padding: 0 20px;  
   color: #fff;  
}

.dr-menu ul li a:hover {  
   color: #60a773;  
}

.dr-icon:before,  
.dr-icon:after {  
   position: relative;  
   font-family: 'icomoon';  
   speak: none;  
   font-style: normal;  
   font-weight: normal;  
   font-variant: normal;  
   text-transform: none;  
   -webkit-font-smoothing: antialiased;  
}  

.dr-menu ul .dr-icon:before {  
   margin-right: 15px;  
}  

.dr-icon-bullhorn:before {  
   content: "\e000";  
}  

.dr-icon-camera:before {  
   content: "\e002";  
}  

.dr-icon-heart:before {  
   content: "\e003";  
}  

.dr-icon-settings:before {  
   content: "\e004";  
}  

.dr-icon-switch:before {  
   content: "\e005";  
}  

.dr-icon-download:before {  
   content: "\e006";  
}  

.dr-icon-user:before {  
   content: "\e001";  
}  

.dr-icon-menu:before {  
   content: "\e007";  
}

<script src="/js/ytmenu.js"></script>