body{
    font-family: Arial, Helvetica, sans-serif;
    background:#f5f5f5;
    margin:0;
}

header{
    background:#333;
    color:white;
    padding:15px;
}

header h1{
    margin:0;
}

nav{
    margin-top:10px;
}

nav a{
    color:white;
    margin-right:20px;
    text-decoration:none;
}

.container{
    width:900px;
    margin:30px auto;
    background:white;
    padding:20px;
}

footer{
    text-align:center;
    margin-top:40px;
    color:#666;
}