.menu{
  align-items:center;
  justify-content:center;
  width:48px;
  height:48px;
  padding:0;
  border:1px solid transparent;
  background:transparent;
  font:inherit;
  font-size:1.7rem;
  line-height:1;
  cursor:pointer;
}
.menu:hover,.menu:focus-visible{border-color:var(--green);outline:0}
@media(max-width:840px){
  .nav{isolation:isolate}
  .links{
    z-index:20;
    top:89px;
    box-shadow:0 18px 35px rgba(0,0,0,.35);
  }
  .menu{display:inline-flex}
}