.xg_menu a:before{
	content: "";
    position: absolute;
    bottom: -10px;
    left: 50%;
    width: 0;
    height: 1px;
    background: #111;
    opacity: 0;
    -webkit-transition: all .8s cubic-bezier(.19,1,.22,1);
    transition: all .8s cubic-bezier(.19,1,.22,1);
    -webkit-transition-timing-function: cubic-bezier(.19,1,.22,1);
    transition-timing-function: cubic-bezier(.19,1,.22,1);
}

.xg_menuLi1:hover a:before{
	opacity: 1;
    left: 0;
    width: 100%;
}