Background Gradient Animation

gradient.css

#gradient {
  background: linear-gradient(-45deg,#ee7752,#e73c7e,#23a6d5,#23d5ab);
  background-size: 400% 400%;
  -webkit-animation: Gradient 15s ease infinite;
  -moz-animation: Gradient 15s ease infinite;
  animation: Gradient 15s ease infinite;
}
@-webkit-keyframes Gradient {
    0% {
        background-position: 0 50%
    }

    50% {
        background-position: 100% 50%
    }

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

    50% {
        background-position: 100% 50%
    }

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

    50% {
        background-position: 100% 50%
    }

    100% {
        background-position: 0 50%
    }
}