Answers for "backgroung image animation"

css animate background image

// use CSS3 @keyframes to animate the background-position
@keyframes animatedBackground {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 100% 0;
  }
}
#animate-area {
  width: 200px;
  height: 200px;
  background-image: url(http://placekitten.com/400/200);
  background-position: 0px 0px;
  background-repeat: repeat-x;
  animation: animatedBackground 10s linear infinite alternate;
}

<div id="animate-area"></div>

css animated background

/*
	use @keyframes and the animation property
	see this code running here: https://codepen.io/hylobates-lar/pen/qBbQeON
*/
html, body {
  width: 100%;
  height:100%;
}

body {
    background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
    background-size: 400% 400%;
    animation: gradient 15s ease infinite;
}

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