body {background-color: d5ff80;
}

container {background-color: eeffcc;
width:  800px;
margin-left: auto;
margin-right: auto
}


header  {
    Background-color: 77b300;
    color: white: white
    text-align: center;
}

content {
    padding: 10px;
}

nav {width: 180px;
float: left;
}

main {width:  600px
float: right;
}