.nav-item{position:relative;overflow:hidden}.nav-item:after{content:"";position:absolute;top:50%;left:50%;width:5px;height:5px;background:rgba(0,0,0,.2);opacity:0;border-radius:100%;transform:scale(1) translate(-50%);transform-origin:50% 50%}.nav-item:active:after{animation:ripple .4s ease-out}@keyframes ripple{0%{transform:scale(0);opacity:1}20%{transform:scale(25);opacity:1}to{opacity:0;transform:scale(40)}}