学习做旋转魔方 (css3)

看到一个帖子做了一个旋转魔方, 想着试着学习练练手.

看着高手的代码按照自己的思路, 码了一下, 记下遇到的一些问题.

html 代码片段

3D 魔方 Rubik's Cube

*{margin:0;padding:0;}/*radial-gradient(ellipse 100px 50px at 30%

20%,#adbf41 ,#328a26) radial-gradient(circle 100px at 30% 20%,#adbf41 ,#328a26)*/

HTML{height:100%;/*background: radial-gradient(#adbf41, #328a26);*/

}.stage{width:20em;height:20em;position:absolute;top:0;left:

0;right:0;bottom:0;margin:auto;perspective:1000px;-webkit-perspective:

1000px;perspective:1000px;}.cube*{position:absolute;width:100%;

height:100%;box-shadow:005emrgba(255,255,255,0.4);background:

-webkit-linear-gradient(left,rgba(85,85,85,1)0px,rgba(85,85,85,

1)3px,rgba(0,0,0,0)0px),-webkit-linear-gradient(top,rgba(85,85,

85,1)0px,rgba(85,85,85,1)3px,rgba(0,0,0,0)0px);background-size:

2.5em2.5em;border:2pxsolid rgba(85,85,85,1);border-top:none;border-left:none;

border-radius:0.2em;}.font{background-color:rgba(255,255,255,1);

transform:translateZ(10em);}.back{background-color:rgba(255,213,

0,1);transform:rotateX(180deg)translateZ(10em);}.left{background-color:

rgba(0,70,173,1);transform:rotateY(-90deg)translateZ(10em);}.right

{background-color:rgba(0,155,72,1);transform:rotateY(90deg)translateZ(10em);

}.top{background-color:rgba(183,18,52,1);transform:rotateX(90deg)

translateZ(10em);}.bottom{background-color:rgba(255,88,0,1);transform:

rotateX(-90deg)translateZ(10em);}.cube{position:absolute;width:

100%;height:100%;-o-animation:spin linear6sinfinite,bigchange linear

6s;animation:spin linear6sinfinite,bigchange linear6s;-moz-transform-style:

preserve-3d;-ms-transform-style:preserve-3d;transform-style:preserve-3d;

-webkit-transform-style:preserve-3d;/* 使被转换的子元素保留其 3D 转换:*/}@-webkit-keyframes

spin{0%{-webkit-transform:translateZ(-10em)rotateX(0)rotateY(0deg);

-ms-transform:translateZ(-10em)rotateX(0)rotateY(0deg);-o-transform:

translateZ(-10em)rotateX(0)rotateY(0deg);transform:translateZ(-10em)

rotateX(0)rotateY(0deg);}100%{-webkit-transform:translateZ(-10em)

rotateX(360deg)rotateY(360deg);-ms-transform:translateZ(-10em)rotateX(360deg)

rotateY(360deg);-o-transform:translateZ(-10em)rotateX(360deg)rotateY(360deg);

transform:translateZ(-10em)rotateX(360deg)rotateY(360deg);}}@-webkit-keyframes

bigchange{0%{width:0em;height:0em;}100%{width:20em;height:

20em;}}