@keyframes blackhole{to{transform:translateY(-100vh)}}.blackhole:after{content:"";height:calc(100% + 10px);width:calc(100% + 10px);border:5px solid #000;border-right-color:transparent;border-bottom-color:transparent;border-radius:50%;position:absolute;top:-5px;left:-5px;z-index:5px;transform:rotate(45deg)}