html {
     background:#BBF8A2;
     }

body {
     width: 1000px;
     margin:30px auto;
     
     }
     
header, main, footer {
    border-radius: 20px;
     } 
     
main,footer{
     background: white
     } 
     
header  {
    /*background:#E6E6FA;
    text-align: center;
    color: white;
    padding: 15px;*/
    
  height: 250px;
  background: url(mmm.jpg);
  background-size: cover;
  background-position: center;
  padding: 15px;
  color: white;
  text-align: center; 
  } 
   
header h1{ 
  margin-top: 60px;
  text-shadow: 0 0 10px black
  }     

           
nav a {
    padding: 40px;
    color: black;
    text-decoration: none;
    }
 
nav a:hover {color:blue;} 

main {
   padding: 30px;
   margin: 15px 0;
   } 
     
     
footer {
    padding: 15px;
    color: pale grey;
    text-align: center;
    }