这是一款效果非常炫酷的Bootstrap垂直手风琴折叠菜单特效。在该bootstrap垂直手风琴折叠菜单中，每个菜单项通过css3阴影制作出带立体感觉的纸张效果，非常炫酷。

使用方法

在页面中引入jquery和bootstrap相关文件，以及fontawsome字体图标文件。。

HTML结构

该Bootstrap垂直手风琴折叠菜单的HTML结构如下。

    

        

            

                

                    

                        

                            
                                
                                Section 1
                            
                        
                    
                    

                        

                            
Lorem ipsum dolor sit amet...
                        
                    
                
                

                    

                        

                            
                                
                                Section 2
                            
                        
                    
                    

                        

                            
Lorem ipsum dolor sit amet...
                        
                    
                
                

                    

                        

                            
                                
                                Section 3
                            
                        
                    
                    

                        

                            
Lorem ipsum dolor sit amet...
                        
                    
                
            
        
    
                
 CSS样式
                
然后为该Bootstrap垂直手风琴折叠菜单添加下面的CSS样式，对其进行美化。
                
a:hover,a:focus{
    text-decoration: none;
    outline: none;
}
#accordion .panel{
    border: none;
    border-radius: 0;
    box-shadow: none;
    margin: 0 0 10px;
    overflow: hidden;
    position: relative;
}
#accordion .panel-heading{
    padding: 0;
    border: none;
    border-radius: 0;
    margin-bottom: 10px;
    z-index: 1;
    position: relative;
}
#accordion .panel-heading:before,
#accordion .panel-heading:after{
    content: "";
    width: 50%;
    height: 20%;
    box-shadow: 0 15px 5px rgba(0, 0, 0, 0.4);
    position: absolute;
    bottom: 15px;
    left: 10px;
    transform: rotate(-3deg);
    z-index: -1;
}
#accordion .panel-heading:after{
    left: auto;
    right: 10px;
    transform: rotate(3deg);
}
#accordion .panel-title a{
    display: block;
    padding: 15px 70px 15px 70px;
    margin: 0;
    background: #fff;
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 1px;
    color: #d11149;
    border-radius: 0;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1), 0 0 40px rgba(0, 0, 0, 0.1) inset;
    position: relative;
}
#accordion .panel-title a:before,
#accordion .panel-title a.collapsed:before{
    content: "\f106";
    font-family: fontawesome;
    width: 55px;
    height: 100%;
    text-align: center;
    line-height: 50px;
    border-left: 2px solid #D11149;
    position: absolute;
    top: 0;
    right: 0;
}
#accordion .panel-title a.collapsed:before{ content: "\f107"; }
#accordion .panel-title a .icon{
    display: inline-block;
    width: 55px;
    height: 100%;
    border-right: 2px solid #d11149;
    font-size: 20px;
    color: rgba(0,0,0,0.7);
    line-height: 50px;
    text-align: center;
    position: absolute;
    top: 0;
    left: 0;
}
#accordion .panel-body{
    padding: 10px 20px;
    margin: 0 0 20px;
    border-bottom: 3px solid #d11149;
    border-top: none;
    background: #fff;
    font-size: 15px;
    color: #333;
    line-height: 27px;
}