.navi ul li a{width: 18%;}
.navi ul li a.toggle{float:right;}
.navi ul li a.toggle:before{left: inherit;background-position: -3rem -1rem;margin: 0;top: 50%;transform: translateY(-50%);right: 15px;}

.navi ul li.sub ul{display:none;}
.navi ul li.sub.expand > ul{display:block;}
.navi ul li.expand > a.toggle:before{background-position: -3rem -1rem;transform: rotate(90deg);top:40%;}