<div id="container">
  <div id="container-inside">
      <div id="circle-small"></div>
      <div id="circle-medium"></div>
      <div id="circle-large"></div>
      <div id="circle-xlarge"></div>
      <div id="circle-xxlarge"></div>
  </div>
</div>
Inspiration: http://schlem.me/

#container{
    background: #00adef;
    background: -moz-linear-gradient(-45deg, #00adef 0%, #0076e5 100%);
    background: -webkit-linear-gradient(-45deg, #00adef 0%,#0076e5 100%);
    background: linear-gradient(135deg, #00adef 0%,#0076e5 100%);
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00adef', endColorstr='#0076e5',GradientType=1 );
    position: relative;
    height: 700px;
    width: 100%;
    margin: 0px auto;
    padding: 0px auto;
}

#container-inside {
    position: relative;
    min-width: 960px;
    max-width: 1280px;
    height: auto;
    min-height: 100%;
    margin: 0px auto;
    padding: 0px auto;
    overflow: visible;
}

#circle-small {
    -webkit-animation: circle-small-scale 3s ease-in-out infinite alternate;
    animation: circle-small-scale 3s ease-in-out infinite alternate;
	animation-timing-function: cubic-bezier(.6, 0, .4, 1);
	animation-delay: 0s;
	position: absolute;
	top: 200px;
	left: -150px;
    background: #fff;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    opacity: 0.4;
}

#circle-medium {
    -webkit-animation: circle-small-scale 3s ease-in-out infinite alternate;
    animation: circle-small-scale 3s ease-in-out infinite alternate;
	animation-timing-function: cubic-bezier(.6, 0, .4, 1);
	animation-delay: 0.3s;
	position: absolute;
	top: 50px;
	left: -300px;
    background: #fff;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    opacity: 0.3;
}

#circle-large {
    -webkit-animation: circle-small-scale 3s ease-in-out infinite alternate;
    animation: circle-small-scale 3s ease-in-out infinite alternate;
	animation-timing-function: cubic-bezier(.6, 0, .4, 1);
	animation-delay: 0.6s;
	position: absolute;
	top: -100px;
	left: -450px;
    background: #fff;
    width: 900px;
    height: 900px;
    border-radius: 50%;
    opacity: 0.2;
}

#circle-xlarge {
    -webkit-animation: circle-small-scale 3s ease-in-out infinite alternate;
    animation: circle-small-scale 3s ease-in-out infinite alternate;
	animation-timing-function: cubic-bezier(.6, 0, .4, 1);
	animation-delay: 0.9s;
	position: absolute;
	top: -250px;
	left: -600px;
    background: #fff;
    width: 1200px;
    height: 1200px;
    border-radius: 50%;
    opacity: 0.1;
}

#circle-xxlarge {
    -webkit-animation: circle-small-scale 3s ease-in-out infinite alternate;
    animation: circle-small-scale 3s ease-in-out infinite alternate;
	animation-timing-function: cubic-bezier(.6, 0, .4, 1);
	animation-delay: 1.2s;
	position: absolute;
	top: -400px;
	left: -750px;
    background: #fff;
    width: 1500px;
    height: 1500px;
    border-radius: 50%;
    opacity: 0.05;
}

@-webkit-keyframes circle-small-scale {
    0% {
        -webkit-transform: scale(1.0);
    }
    100% {
        -webkit-transform: scale(1.1);
    }
}

@keyframes circle-small-scale {
    0% {
        transform: scale(1.0);
    }
    100% {
        transform: scale(1.1);
    }
}