body{

margin:0;
font-family:Arial;

background:#f5f5f5;

}

header{

background:#00695c;

color:white;

padding:50px;

text-align:center;

}

nav{

background:#004d40;

padding:15px;

text-align:center;

}

nav a{

color:white;

margin:20px;

text-decoration:none;

font-weight:bold;

}