.wrapper {
    width: 900px;
    padding: 20px;
    margin: 0 auto;
    margin-top: 30px;
    margin-bottom: 30px;
}
.header {
    padding-bottom: 20px;
    padding-left: 20px;
    border-bottom: 5px solid #eee;
    margin-bottom: 30px;
    height: 70px;
}
footer {
    border-top: 5px solid #eee;
    background-color: #eee;
    padding: 20px;
}
article {
    padding-left: 20px;
    padding-right: 20px;
    padding-bottom: 20px;
}