下面的例子是一个简单的布局

最上面是header，左边是一个logo（老男孩），右边是用户的登录信息

中间一大块是内容，内容左侧是菜单，右侧是具体的内容

代码如下：

body的margin为0，确保边上全部填满

absolute 确保位置不变; 注意如果他的父级标签有relative，他相对于这个父级标签的位置不变，否则相对于body的位置不变

overflow 在内容超过标签范围之后会自动加个滚轮

font-awesome插件可以使用现成的小标签

    
     
              
      
           
           
           
                   
       
            
        
             老男孩        
         
              
          
               
           
                    
            
                 
             
              我的资料    
              
               注销            
               
                    
                
                     
                 5         
                 
                      
                  
                               
                   
                        
                    
                     a    
                     
                          
                          
                          
                      
                           
                       
                        asdf
                        
                        
asdf
                        
asdf
                        
asdf
                        
asdf
    
                        
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效果如下