Night sky is always soothing and beautiful. So why not to put this as your webpage background? The following scripts provides a night sky comprises a moon, moving clouds and twinkling stars. This 3D animating background can lead you site look different!

HTML
<!-- this script got from www.devanswer.com -->
<div class="background-container"> <img src="http://devanswer.com/codes/files/moon.png" alt=""> <div class="stars"></div> <div class="twinkling"></div> <div class="clouds"></div> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css"><a style="font-size: 8pt; text-decoration: none" target="_blank" href="http://www.devanswer.com">Developer Code</a>

CSS
@keyframes move-background {
  from {
    -webkit-transform: translate3d(0px, 0px, 0px);
  }
  to {
    -webkit-transform: translate3d(1000px, 0px, 0px);
  }
}
@-webkit-keyframes move-background {
  from {
    -webkit-transform: translate3d(0px, 0px, 0px);
  }
  to {
    -webkit-transform: translate3d(1000px, 0px, 0px);
  }
}
@-moz-keyframes move-background {
  from {
    -webkit-transform: translate3d(0px, 0px, 0px);
  }
  to {
    -webkit-transform: translate3d(1000px, 0px, 0px);
  }
}
@-webkit-keyframes move-background {
  from {
    -webkit-transform: translate3d(0px, 0px, 0px);
  }
  to {
    -webkit-transform: translate3d(1000px, 0px, 0px);
  }
}
.background-container {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
}

.stars {
  background: black url(http://devanswer.com/codes/files/stars.png) repeat;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  display: block;
  z-index: 0;
}

.twinkling {
  width: 10000px;
  height: 100%;
  background: transparent url("http://devanswer.com/codes/files/twinkling.png") repeat;
  background-size: 1000px 1000px;
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  z-index: 2;
  -moz-animation: move-background 70s linear infinite;
  -ms-animation: move-background 70s linear infinite;
  -o-animation: move-background 70s linear infinite;
  -webkit-animation: move-background 70s linear infinite;
  animation: move-background 70s linear infinite;
}

.clouds {
  width: 10000px;
  height: 100%;
  background: transparent url("http://devanswer.com/codes/files/clouds_repeat.png") repeat;
  background-size: 1000px 1000px;
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  z-index: 3;
  -moz-animation: move-background 150s linear infinite;
  -ms-animation: move-background 150s linear infinite;
  -o-animation: move-background 150s linear infinite;
  -webkit-animation: move-background 150s linear infinite;
  animation: move-background 150s linear infinite;
}

img {
  height: 70vh;
  width: 70vh;
  position: absolute;
  z-index: 3;
  right: 20px;
}