body {                                                                                                            
       font-family: sans-serif;                                                                                      
       margin: 0;                                                                                                    
       padding: 0;                                                                                                   
       background-color: #f4f4f4;                                                                                    
       color: #333;                                                                                                  
   }                                                                                                                 
                                                                                                                     
   header {                                                                                                          
      background-color: #333;                                                                                       
      color: #fff;                                                                                                  
      padding: 1rem;                                                                                                
      text-align: center;                                                                                           
 }                                                                                                                 
                                                                                                                    
  main {                                                                                                            
      padding: 2rem;                                                                                                
      text-align: center;                                                                                           
  }                                                                                                                 
                                                                                                                    
  footer {                                                                                                          
      background-color: #333;                                                                                       
      color: #fff;                                                                                                  
      padding: 1rem;                                                                                                
      text-align: center;                                                                                           
      position: absolute;                                                                                           
      bottom: 0;                                                                                                    
      width: 100%;                                                                                                  
  }