3D Cube using 2D CSS transformations
 

.cube {
position: relative;
top: 200px;
}

.rightFace,
.leftFace,
.topFace div {
padding: 10px;
width: 180px;
height: 180px;
}

.rightFace,
.leftFace,
.topFace {
position: absolute;
}

.leftFace {
-webkit-transform: skewY(30deg);
-moz-transform: skewY(30deg);
background-color: #ccc;
}

.rightFace {
-webkit-transform: skewY(-30deg);
-moz-transform: skewY(-30deg);
background-color: #ddd;
left: 200px;
}

.topFace div {
-webkit-transform: skewY(-30deg) scaleY(1.16);
-moz-transform: skewY(-30deg) scaleY(1.16);
background-color: #eee;
font-size: 0.862em;
}

.topFace {
-webkit-transform: rotate(60deg);
-moz-transform: rotate(60deg);
top: -158px;
left: 100px;
}

.cube {
position: relative;
top: 200px;
}

.rightFace,
.leftFace,
.topFace div {
padding: 10px;
width: 180px;
height: 180px;
}

.rightFace,
.leftFace,
.topFace {
position: absolute;
}

.leftFace {
-webkit-transform: skewY(30deg);
-moz-transform: skewY(30deg);
background-color: #ccc;
}

.rightFace {
-webkit-transform: skewY(-30deg);
-moz-transform: skewY(-30deg);
background-color: #ddd;
left: 200px;
}

.topFace div {
-webkit-transform: skewY(-30deg) scaleY(1.16);
-moz-transform: skewY(-30deg) scaleY(1.16);
background-color: #eee;
font-size: 0.862em;
}

.topFace {
-webkit-transform: rotate(60deg);
-moz-transform: rotate(60deg);
top: -158px;
left: 100px;
}