aside{
   font-size: 16px;
   width: 220px; 
   position: fixed;
   top: 0;
   left: 0;
   height: 100%;
   z-index: 999;
   background-image:linear-gradient(to top, #555, #000);
   
}

.latAparece{
	left: 0px;
	transition:all .3s ease;
}
.latDesaparece{
	left: -220px; 
	transition:all .3s ease;
}