.banner4_yuan{
	position: absolute;
	width: 705px;
	height: 705px;
	background:url(../images/yuan2.png) no-repeat 100%;
	animation: animtrans 32s linear infinite;
	-webkit-animation: animtrans 32s linear infinite;
	left: 32%;
    top: -100%;
    transform: translateX(-50%) translateY(-50%);
}

@keyframes animtrans {
	from{
		transform: rotateZ(360deg);
	}
	to{
		transform: rotateZ(0deg);
	}
}
.banner2{
    animation: animate-cloud 12s ;
}


@-webkit-keyframes animate-cloud {
    from {
      background-position: 100% 0px;
    }
    to {
      background-position: 100% -500px;
    }
  }