body{
font-family:Arial, sans-serif;
margin:0;
}

header{
background:#333;
color:white;
text-align:center;
padding:20px;
}

nav{
background:#555;
text-align:center;
padding:10px;
}

nav a{
color:white;
margin:10px;
text-decoration:none;
}

main{
padding:20px;
}

footer{
background:#333;
color:white;
text-align:center;
padding:15px;
}