body{
    margin:0;
    font-family:Arial,sans-serif;
    color:#222;
    background-color:#f5f5f5;
}

header{
    padding:24px;
    background-color:#222;
    color:white;
    text-align:center;
}
main{
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}
section{
    padding:24px;
    background-color:white;
    border-radius:8px;
}
h1,
h2,
p{
    margin-top:0;
}
p{
    line-height:1.7;
}