button.pagebreak {
    background-color: lightgrey;
    border-top: 1px solid black;
    display: block;
    margin-bottom: 10px;
    width: 100%;
}
section {
    padding-left: .25em;
    width: calc(100% - .25em);
}
article {
    width: 48vw;
}
body {
   font-size: 1.5em;
   line-height: 1.6em;
}