Animate background gradient

background_animated_gradient.css

background: linear-gradient(235deg, #ff8a00, #da1b60);
background-size: 400% 400%;

-webkit-animation: animateBackgroundGradient 20s ease infinite;
-moz-animation: animateBackgroundGradient 20s ease infinite;
animation: animateBackgroundGradient 20s ease infinite;

@-webkit-keyframes animateBackgroundGradient {
    0%{background-position:0% 50%}
    50%{background-position:100% 50%}
    100%{background-position:0% 50%}
}

@-moz-keyframes animateBackgroundGradient {
    0%{background-position:0% 50%}
    50%{background-position:100% 50%}
    100%{background-position:0% 50%}
}

@keyframes animateBackgroundGradient { 
    0%{background-position:0% 50%}
    50%{background-position:100% 50%}
    100%{background-position:0% 50%}
}