.HYPE_scene {
    animation: colorchange2 20s infinite alternate; /* animation-name followed by duration in seconds*/
}

@keyframes colorchange2 {
    0%   {background: #d6e8e4;}
    25%  {background: #c8ded2;}
    50%  {background: #dcdaeb;}
    75%  {background: #e3cfcf;}
    100% {background: #c1cfe4;}
}