css3 手写正方体实现3D旋转

html：

    <div class="container">
        <div class="back"></div>
        <div class="prev"></div>
        <div class="bg1">
            <div class="item">bg1</div>
        </div>
        <div class="bg2">
            <div class="item">bg2</div>
        </div>
        <div class="bg3">
            <div class="item">bg3</div>
        </div>
        <div class="bg4">
            <div class="item">bg4</div>
        </div>
    </div>

css：

.container {
	position: absolute;
	width: 0;
	height: 0;
	top: 50%;
	left: 50%;
	margin-left: -50px;
	margin-top: -50px;
	transform-style: preserve-3d;
	animation: moves 3.5s linear infinite;
}
.back,.prev {
	position: absolute;
	width: 100px;
	height: 100px;
	background-color: rgba(255, 0, 0, .5);
	/*border: 1px solid;*/
}
.prev {
	top: 0;
	transform: translateZ(100px);
}
.bg1,.bg2,.bg3,.bg4 {
	position: absolute;
	top: 0;
	background-color: transparent;
}
.bg1,.bg2 {
	width: 200px;
	height: 100px;
	transform: rotateY(90deg);	
}
.bg1 {
	transform: rotateY(90deg) translateZ(-100px);
}
.bg3,.bg4 {
	width: 100px;
	height: 200px;
	transform: rotateX(90deg) translateY(100px);
}
.bg3 {
	transform: rotateX(90deg) translateZ(100px) translateY(100px);
}
.item {
	background-color: rgba(0, 255, 255, .5);
	width: 100px;
	height: 100px;
	/*border: 1px solid;*/
}
.bg1>.item {
	background-color: rgba(0, 255, 0, .5);
}
.bg2>.item {
	background-color: rgba(0, 0, 255, .5);
}
.bg3>.item {
	background-color: rgba(255, 255, 0, .5);
}
@keyframes moves {
	0% {
		transform: rotateX(0deg) rotateY(0deg);
	}
	100% {
		transform: rotateX(360deg) rotateY(360deg);
	}
}

图片版展示：
（截了几个图供参考）