.I4UNsa_button{position:relative;overflow:hidden}.I4UNsa_progress{width:100%;height:3px;transform-origin:0;background:currentColor;animation-name:I4UNsa_countdown;animation-timing-function:linear;animation-fill-mode:forwards;position:absolute;bottom:0;left:0}@keyframes I4UNsa_countdown{0%{transform:scaleX(1)}to{transform:scaleX(0)}}