源码下载

一起看下实现的代码：

html代码：

css代码：

body
{
background: #f7f7f7 url("1.jpg") no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
font-family: "Roboto";
font-size: 14px;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
body::before
{
content: '';
position: fixed;
z-index: -1;
top: 0;
left: 0;
background: #34495e; /* IE Fallback */
background: rgba(52, 73, 94, 0.8);
width: 100%;
height: 100%;
}
nav
{
position: absolute;
top: 50%;
left: 50%;
width: 360px;
margin: -78px 0 100px -180px;
-webkit-box-shadow: 0 0 3px rgba(0, 0, 0, 0.1);
-moz-box-shadow: 0 0 3px rgba(0, 0, 0, 0.1);
box-shadow: 0 0 3px rgba(0, 0, 0, 0.1);
}
nav ul
{
list-style: none;
margin: 0;
padding: 0;
}
nav ul li
{
/* Sub Menu */
}
nav ul li a
{
display: block;
background: #3498db;
padding: 10px 15px;
color: #fff;
text-decoration: none;
-webkit-transition: 0.2s linear;
-moz-transition: 0.2s linear;
-ms-transition: 0.2s linear;
-o-transition: 0.2s linear;
transition: 0.2s linear;
}
nav ul li a:hover
{
background: #2980b9;
}
nav ul li a .fa
{
width: 16px;
text-align: center;
margin-right: 5px;
}
nav ul li a .badge
{
display: inline-block;
background: #fff; /* IE Fallback */
background: rgba(255, 255, 255, 0.2);
padding: 3px 7px;
color: #fff;
font-size: 12px;
font-weight: 800;
}
nav ul li ul li a
{
background: #444;
border-left: 4px solid transparent;
padding: 10px 20px;
}
nav ul li ul li a:hover
{
background: #333;
border-left: 4px solid #3498db;
}
/* Float Right/Left */
.right
{
float: right;
}
.left
{
float: left;
}

js代码：