GradientAnimator

.css-selector {
    background: linear-gradient(270deg, #19007a, #a2e1d0);
    background-size: 400% 400%;
    -webkit-animation: AnimationName 0s ease infinite;
    -moz-animation: AnimationName 0s ease infinite;
    -o-animation: AnimationName 0s ease infinite;
    animation: AnimationName 0s ease infinite;
}
@-webkit-keyframes AnimationName {
    0%{background-position:0% 50%}