ul#menu li.actif a{
	border-bottom:3px solid #;
}
ul#menu li.actif a:after{
	content: '';
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-bottom: 12px solid #;
    width: 0;
    height: 0;
    position: absolute;
    bottom: 0px;
    left: calc(50% - 6px);
}