.btngro{background:linear-gradient(45deg,red,orange);background-size:300% 300%;animation:gradientSlide 3s linear infinite;padding:10px 20px;color:white;font-weight:bold;border-radius:30px;border:none;outline:none;cursor:pointer}@keyframes gradientSlide{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}