Cloud - from CSSPop

cloud.css

body {
background: #ccc;
}
#cloud {
width: 350px; height: 120px;
 
background: #f2f9fe;
background: linear-gradient(top, #f2f9fe 5%, #d6f0fd 100%);
background: -webkit-linear-gradient(top, #f2f9fe 5%, #d6f0fd 100%);
background: -moz-linear-gradient(top, #f2f9fe 5%, #d6f0fd 100%);
background: -ms-linear-gradient(top, #f2f9fe 5%, #d6f0fd 100%);
background: -o-linear-gradient(top, #f2f9fe 5%, #d6f0fd 100%);
 
border-radius: 100px;
-webkit-border-radius: 100px;
-moz-border-radius: 100px;
 
position: relative;
margin: 120px auto 20px;
}
 
#cloud:after, #cloud:before {
content: '';
position: absolute;
background: #f2f9fe;
z-index: -1
}
 
#cloud:after {
width: 100px; height: 100px;
top: -50px; left: 50px;
 
border-radius: 100px;
-webkit-border-radius: 100px;
-moz-border-radius: 100px;
}
 
#cloud:before {
width: 180px; height: 180px;
top: -90px; right: 50px;
 
border-radius: 200px;
-webkit-border-radius: 200px;
-moz-border-radius: 200px;
}
 
.shadow {
width: 350px;
position: absolute; bottom: -10px;
background: #000;
z-index: -1;
 
box-shadow: 0 0 25px 8px rgba(0, 0, 0, 0.4);
-moz-box-shadow: 0 0 25px 8px rgba(0, 0, 0, 0.4);
-webkit-box-shadow: 0 0 25px 8px rgba(0, 0, 0, 0.4);
 
border-radius: 50%;
-moz-border-radius: 50%;
-webkit-border-radius: 50%;
}

cloud.html

<div id = "cloud"><span class='shadow'></span></div>