html,body{margin:0;padding:0;overflow:hidden;width:100%;height:100%;background-color:#ddd}main{display:flex;flex-direction:column;width:100%;height:100%;box-sizing:border-box}div.expiration{color:#002664;font-size:1.2rem;text-align:center;font-family:Ubuntu,'Ubuntu Fallback',Rubik,Roboto,"Helvetica Neue",Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";font-weight:400;font-style:normal;margin:1rem 0 0;flex-shrink:0}#df_book{width:100%;flex-grow:1;overflow:hidden}