body{

font-family: Arial, sans-serif;
margin:0;
background:#f5f5f5;
line-height:1.6;

}

header{

background:#0077cc;
color:white;
padding:20px;
text-align:center;

}

nav{

margin-top:10px;

}

nav a{

color:white;
margin:10px;
text-decoration:none;
font-weight:bold;

}

nav a:hover{

text-decoration:underline;

}

main{

max-width:900px;
margin:auto;
background:white;
padding:30px;

}

section{

margin-bottom:30px;

}

footer{

background:#222;
color:white;
text-align:center;
padding:15px;
margin-top:30px;

}