.snowflake {
  -webkit-animation: spin 4s linear infinite;
  -moz-animation: spin 4s linear infinite;
  animation: spin 4s linear infinite;
}
 @-moz-keyframes 
spin { 100% {
-moz-transform: rotate(360deg);
}
}
 @-webkit-keyframes 
spin { 100% {
-webkit-transform: rotate(360deg);
}
}
 @keyframes 
spin { 100% {
-webkit-transform: rotate(360deg);
transform:rotate(360deg);
}
}