html, body{
    background-color:lightgrey;
    margin: 0;
    padding: 0;
    height: 100vh;
    overflow: hidden;
}

article.page{
    height: 100vh;
    width: 70%;
    padding-top: 5px;
    padding-bottom: 10px; 
    margin: auto;
    background-color: white;
    overflow-y: auto;
}