导航菜单其实是没有什么可说的，制作方法到处可见，今天这个案例本来不只是一个导
航，还有一个搜索表单的，可是为了偷懒，把搜索表单部分去掉了，就变成了一个CSS3制作的下拉菜单。在这个导航中主要两点，一个是渐变运用，另一个就是box-shodow制作的立体效果。HTML 结构：
CSS代码
*{ margin: 0; padding: 0;}body { padding: 50px; background: url(data:image/j...); font-family: 'Jockey One', sans-serif; color: #fff;}a { color: rgb(1, 124, 185); text-decoration: none;}li { list-style: none outside none;}#nav:after,#nav:before { content:""; display: table;}#nav:after { clear:both; overflow: hidden;}#nav { zoom: 1; margin: 50px auto; width: 530px;}#nav > li{ float: left; display: inline; border-right: 1px solid #848d95; border-left: 1px solid #e3e8ec; box-shadow: 0 1px 0 rgba(84,95,109,0.75),0 2px 0 rgba(84,95,109,0.75),0 3px 0 rgba(84,95,109,0.75); position: relative; background-color: #c5cfd8; /* Old browsers */ /* IE9 SVG, needs conditional override of 'filter' to 'none' */ background-image: url(data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiA/Pgo8c3ZnIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgdmlld0JveD0iMCAwIDEgMSIgcHJlc2VydmVBc3BlY3RSYXRpbz0ibm9uZSI+CiAgPGxpbmVhckdyYWRpZW50IGlkPSJncmFkLXVjZ2ctZ2VuZXJhdGVkIiBncmFkaWVudFVuaXRzPSJ1c2VyU3BhY2VPblVzZSIgeDE9IjAlIiB5MT0iMCUiIHgyPSIwJSIgeTI9IjEwMCUiPgogICAgPHN0b3Agb2Zmc2V0PSIwJSIgc3RvcC1jb2xvcj0iI2M1Y2ZkOCIgc3RvcC1vcGFjaXR5PSIxIi8+CiAgICA8c3RvcCBvZmZzZXQ9IjEwMCUiIHN0b3AtY29sb3I9IiM5Y2E4YjEiIHN0b3Atb3BhY2l0eT0iMSIvPgogIDwvbGluZWFyR3JhZGllbnQ+CiAgPHJlY3QgeD0iMCIgeT0iMCIgd2lkdGg9IjEiIGhlaWdodD0iMSIgZmlsbD0idXJsKCNncmFkLXVjZ2ctZ2VuZXJhdGVkKSIgLz4KPC9zdmc+); background-image: -moz-linear-gradient(top, #c5cfd8 0%, #9ca8b1 100%); /* FF3.6+ */ background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#c5cfd8), color-stop(100%,#9ca8b1)); /* Chrome,Safari4+ */ background-image: -webkit-linear-gradient(top, #c5cfd8 0%,#9ca8b1 100%); /* Chrome10+,Safari5.1+ */ background-image: -o-linear-gradient(top, #c5cfd8 0%,#9ca8b1 100%); /* Opera 11.10+ */ background-image: -ms-linear-gradient(top, #c5cfd8 0%,#9ca8b1 100%); /* IE10+ */ background-image: linear-gradient(to bottom, #c5cfd8 0%,#9ca8b1 100%); /* W3C */ filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#c5cfd8', endColorstr='#9ca8b1',GradientType=0 ); /* IE6-8 */ -webkit-transition: all 0.25s ease-in .0038s; -moz-transition: all 0.25s ease-in .0038s; -o-transition: all 0.25s ease-in .0038s; transition: all 0.25s ease-in .0038s;}#nav li:first-child { border-left: none; border-radius: 5px 0 0 5px;}#nav li:last-child { border-radius: 0 5px 5px 0; border-right: none;}#nav li:last-child::after { display: none;}#nav .sub-menu { position: absolute; right: 0; left: -1px; top: 100%; border-radius: 0 0 5px 5px; box-shadow: 0 1px 0 rgba(84,95,109,0.75),0 2px 0 rgba(84,95,109,0.75),0 3px 0 rgba(84,95,109,0.75); background-color: #d9e0e5; /* Old browsers */ /* IE9 SVG, needs conditional override of 'filter' to 'none' */ background-image: url(data:image/svg+xml;base64,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); background-image: -moz-linear-gradient(top, #d9e0e5 0%, #c5cdd3 100%); /* FF3.6+ */ background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#d9e0e5), color-stop(100%,#c5cdd3)); /* Chrome,Safari4+ */ background-image: -webkit-linear-gradient(top, #d9e0e5 0%,#c5cdd3 100%); /* Chrome10+,Safari5.1+ */ background-image: -o-linear-gradient(top, #d9e0e5 0%,#c5cdd3 100%); /* Opera 11.10+ */ background-image: -ms-linear-gradient(top, #d9e0e5 0%,#c5cdd3 100%); /* IE10+ */ background-image: linear-gradient(to bottom, #d9e0e5 0%,#c5cdd3 100%); /* W3C */ filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#d9e0e5', endColorstr='#c5cdd3',GradientType=0 ); /* IE6-8 */ display: none;}#nav > li:hover { background-color: #d8dfe4; /* Old browsers */ /* IE9 SVG, needs conditional override of 'filter' to 'none' */ background-image: url(data:image/svg+xml;base64,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); background-image: -moz-linear-gradient(top, #d8dfe4 1%, #d5dee4 100%); /* FF3.6+ */ background-image: -webkit-gradient(linear, left top, left bottom, color-stop(1%,#d8dfe4), color-stop(100%,#d5dee4)); /* Chrome,Safari4+ */ background-image: -webkit-linear-gradient(top, #d8dfe4 1%,#d5dee4 100%); /* Chrome10+,Safari5.1+ */ background-image: -o-linear-gradient(top, #d8dfe4 1%,#d5dee4 100%); /* Opera 11.10+ */ background-image: -ms-linear-gradient(top, #d8dfe4 1%,#d5dee4 100%); /* IE10+ */ background-image: linear-gradient(to bottom, #d8dfe4 1%,#d5dee4 100%); /* W3C */ filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#d8dfe4', endColorstr='#d5dee4',GradientType=0 ); /* IE6-8 */ position: relative; top: 3px; border-right-color: #848d95; box-shadow: -1px 0 0 #848d95; color: #2281cd;}#nav li:hover > ul { display: block;}#nav a { display: block; float: left; padding: 15px 30px; font-size: 16px; color: #2d2f38; text-shadow: 0 1px 0 rgba(225,232,235,0.75); -webkit-transition: all 0.25s ease-in .0038s; -moz-transition: all 0.25s ease-in .0038s; -o-transition: all 0.25s ease-in .0038s; transition: all 0.25s ease-in .0038s;}#nav a:hover { color: #2281cd;}#nav .sub-menu a { color: #2d2f38; font-size: 14px; padding: 10px 30px; float: none;}#nav .sub-menu a:hover { background-color: #a4b0ba; /* Old browsers */ /* IE9 SVG, needs conditional override of 'filter' to 'none' */ background-image: url(data:image/svg+xml;base64,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); background-image: -moz-linear-gradient(top, #a4b0ba 0%, #d5dee4 4%, #b5c0c9 100%); /* FF3.6+ */ background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#a4b0ba), color-stop(4%,#d5dee4), color-stop(100%,#b5c0c9)); /* Chrome,Safari4+ */ background-image: -webkit-linear-gradient(top, #a4b0ba 0%,#d5dee4 4%,#b5c0c9 100%); /* Chrome10+,Safari5.1+ */ background-image: -o-linear-gradient(top, #a4b0ba 0%,#d5dee4 4%,#b5c0c9 100%); /* Opera 11.10+ */ background-image: -ms-linear-gradient(top, #a4b0ba 0%,#d5dee4 4%,#b5c0c9 100%); /* IE10+ */ background-image: linear-gradient(to bottom, #a4b0ba 0%,#d5dee4 4%,#b5c0c9 100%); /* W3C */ filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#a4b0ba', endColorstr='#b5c0c9',GradientType=0 ); /* IE6-8 */ box-shadow: 0 1px 0 rgba(255,255,255,0.75),inset 0 2px 6px rgba(69,78,90,0.15);}#nav .sub-menu li:last-child a:hover { border-radius: 0 0 5px 5px;}
出处：