.nav-icon{width:4rem;height:4rem;overflow:hidden;image-rendering:pixelated}.nav-icon img{width:4rem}.nav-icon img.home{position:relative;top:0}.nav-icon img.webrings{position:relative;top:-4rem}.nav-icon img.projects{position:relative;top:-8rem}.nav-icon img.guestbook{position:relative;top:-12rem}.nav-icon img.guides{position:relative;top:-16rem}