.ani_in{  opacity: 0; transition: all 0.5s ease-in;  transform: translateX(-100px); left:-100px;}
.ani_out{ opacity: 1; transition: all 0.5s ease-out; transform: translateX(-400px);  right:-400px;}

.ani_op{opacity: 0;}
#nav > li > a > i .icon-bg{left:0 !important;}