.underline:after{content:"";position:absolute;bottom:-2px;left:0;width:100%;height:8px;border-radius:5px;background:#68e1fd;z-index:-1}.dynamic-underline,.dynamic-underline-once{position:relative;display:inline-block}.dynamic-underline::after{content:'';position:absolute;bottom:0;left:50%;width:0%;height:6px;border-radius:6px;background-color:#68e1fd;transition:.3s;animation:3s ease-in-out infinite alternate underline-slide}.dynamic-underline-once::after{content:'';position:absolute;bottom:0;left:0;width:0%;height:2px;background-color:#68e1fd;transition:width .5s ease-in-out;animation:3s forwards underline-grow}@keyframes underline-grow{from{width:0}to{width:100%}}@keyframes underline-slide{0%,100%{left:50%;width:0%}50%{left:0;width:100%}}