@import url("http://www.w3cplus.com/demo/css3/base.css");

@font-face {
??? font-family: 'sansationregular';
??? src: url('http://www.w3cplus.com/demo/css3/3DAnimationDropdownMenu/sansation_regular-webfont.eot');
??? src: url('http://www.w3cplus.com/demo/css3/3DAnimationDropdownMenu/sansation_regular-webfont.eot?#iefix') format('http://www.w3cplus.com/demo/css3/3DAnimationDropdownMenu/embedded-opentype'),
???????? url('http://www.w3cplus.com/demo/css3/3DAnimationDropdownMenu/sansation_regular-webfont.woff') format('woff'),
???????? url('http://www.w3cplus.com/demo/css3/3DAnimationDropdownMenu/sansation_regular-webfont.ttf') format('truetype'),
???????? url('http://www.w3cplus.com/demo/css3/3DAnimationDropdownMenu/sansation_regular-webfont.svg#sansationregular') format('svg');
??? font-weight: normal;
??? font-style: normal;
}
body {
?? ?background-color:#edecec;
}

/* basic menu styles */
.nav-menu {
? display: block;
?? ?background: #74adaa;
?? ?width:950px;
?? ?margin: 50px auto 150px;
}
.nav-menu > li {
? display: inline;
? float:left;?? ??? ??? ?
?? ?border-right:1px solid #94c0be;
}
.nav-menu > li:last-child {
? border-right: none;
}
.nav-menu li a {
? color: #fff;
?? ?display: block;
?? ?text-decoration: none;
?? ?font-family: 'sansationregular';
?? ?-webkit-font-smoothing: antialiased;
?? ?-moz-font-smoothing: antialiased;
?? ?font-smoothing: antialiased;
?? ?text-transform: capitalize;
?? ?overflow: visible;
?? ?line-height: 20px;
?? ?font-size: 20px;
?? ?padding: 15px 30px 15px 31px;?? ??? ??? ?
}

/* animation domination */
.three-d {
? -webkit-perspective: 200px;
? -moz-perspective: 200px;
? -ms-perspective: 200px;
? -o-perspective: 200px;
? perspective: 200px;
? -webkit-transition: all .07s linear;
? -moz-transition: all .07s linear;
? -ms-transition: all .07s linear;
? -o-transition: all .07s linear;
? transition: all .07s linear;
? position: relative;
}

.three-d:not(.active):hover {
? cursor: pointer;
}

.three-d:not(.active):hover .three-d-box,
.three-d:not(.active):focus .three-d-box {
? -wekbit-transform: translateZ(-25px) rotateX(90deg);
? -moz-transform: translateZ(-25px) rotateX(90deg);
? -o-transform: translateZ(-25px) rotateX(90deg);
? -ms-transform: translateZ(-25px) rotateX(90deg);
? transform: translateZ(-25px) rotateX(90deg);
}

.three-d-box {
? -webkit-transition: all .3s ease-out;
? -moz-transition: all .3s ease-out;
? -ms-transition: all .3s ease-out;
? -o-transition: all .3s ease-out;
? transition: all .3s ease-out;
? -webkit-transform: translatez(-25px);
? -moz-transform: translatez(-25px);
? -ms-transform: translatez(-25px);
? -o-transform: translatez(-25px);
? transform: translatez(-25px);
? -webkit-transform-style: preserve-3d;
? -moz-transform-style: preserve-3d;
? -ms-transform-style: preserve-3d;
? -o-transform-style: preserve-3d;
? transform-style: preserve-3d;
? -webkit-pointer-events: none;
? -moz-pointer-events: none;
? -ms-pointer-events: none;
? -o-pointer-events: none;
? pointer-events: none;
? position: absolute;
? top: 0;
?? ?left: 0;
?? ?display: block;
?? ?width: 100%;
?? ?height: 100%;
}

.front {
? -webkit-transform: rotatex(0deg) translatez(25px);
? -moz-transform: rotatex(0deg) translatez(25px);
? -ms-transform: rotatex(0deg) translatez(25px);
? -o-transform: rotatex(0deg) translatez(25px);
? transform: rotatex(0deg) translatez(25px);
}

.back {
? -webkit-transform: rotatex(-90deg) translatez(25px);
? -moz-transform: rotatex(-90deg) translatez(25px);
? -ms-transform: rotatex(-90deg) translatez(25px);
? -o-transform: rotatex(-90deg) translatez(25px);
? transform: rotatex(-90deg) translatez(25px);
? color: #FFE7C4;
}

.front, .back {
? display: block;
?? ?width: 100%;
?? ?height: 100%;
?? ?position: absolute;
?? ?top: 0;
?? ?left: 0;
?? ?background: #74adaa;
?? ?padding: 15px 30px 15px 31px;?? ?
?? ?color: white;
?? ?-webkit-pointer-events: none;
? -moz-pointer-events: none;
? -ms-pointer-events: none;
? -o-pointer-events: none;
? pointer-events: none;
? -webkit-box-sizing: border-box;
? box-sizing: border-box;
}
.nav-menu li .active .front,
.nav-menu li .active .back,
.nav-menu li a:hover .front,
.nav-menu li a:hover .back {
? background-color: #51938f;
? -webkit-background-size: 5px 5px;
? background-size: 5px 5px;
? background-position: 0 0, 30px 30px;
? background-image: -webit-linear-gradient(45deg, #478480 25%, transparent 25%, transparent 75%, #478480 75%, #478480), linear-gradient(45deg, #478480 25%, transparent 25%, transparent 75%, #478480 75%, #478480);
? background-image: -moz-linear-gradient(45deg, #478480 25%, transparent 25%, transparent 75%, #478480 75%, #478480), linear-gradient(45deg, #478480 25%, transparent 25%, transparent 75%, #478480 75%, #478480);
?? ?background-image: -ms-linear-gradient(45deg, #478480 25%, transparent 25%, transparent 75%, #478480 75%, #478480), linear-gradient(45deg, #478480 25%, transparent 25%, transparent 75%, #478480 75%, #478480);
? background-image: -o-linear-gradient(45deg, #478480 25%, transparent 25%, transparent 75%, #478480 75%, #478480), linear-gradient(45deg, #478480 25%, transparent 25%, transparent 75%, #478480 75%, #478480);
? background-image: linear-gradient(45deg, #478480 25%, transparent 25%, transparent 75%, #478480 75%, #478480), linear-gradient(45deg, #478480 25%, transparent 25%, transparent 75%, #478480 75%, #478480);
}
.nav-menu ul {
? position: absolute;
?? ?text-align: left;
?? ?line-height: 40px;
?? ?font-size: 14px;
?? ?width: 200px;
?? ?-webkit-transition: all 0.3s ease-in;
? -moz-transition: all 0.3s ease-in;
? -ms-transition: all 0.3s ease-in;
? -o-transition: all 0.3s ease-in;
? transition: all 0.3s ease-in;
? -webkit-transform-origin: 0px 0px;
? -moz-transform-origin: 0px 0px;
? -ms-transform-origin: 0px 0px;
? -o-transform-origin: 0px 0px;
? transform-origin: 0px 0px;
? -webkit-transform: rotateX(-90deg);
? -moz-transform: rotateX(-90deg);
? -ms-transform: rotateX(-90deg);
? -o-transform: rotateX(-90deg);
? transform: rotateX(-90deg);
? -webkit-backface-visibility: hidden;
? -moz-backface-visibility: hidden;
? -ms-backface-visibility: hidden;
? -o-backface-visibility: hidden;
?? ?backface-visibility: hidden;
}
.nav-menu > li:hover ul {
? display: block;
? -webkit-transform: rotateX(0deg);
? -moz-transform: rotateX(0deg);
? -ms-transform: rotateX(0deg);
? -o-transform: rotateX(0deg);
?? ?transform: rotateX(0deg);
}

你可以整體看一下