main{padding:1em;max-width:900px;margin:auto;font-size:20px}#intro{display:grid;grid-template-columns:auto auto;align-items:center}#intro img{max-width:200px}#intro div{padding:1em;margin:1em}#intro div button{padding:1em}#popularBooks{display:grid;grid-template-columns:1fr 1fr 1fr;gap:1em}.book{justify-items:center}.book img{max-width:200px}#listButton{font-family:var(--bodyfont);font-size:.7em;text-decoration:none;color:var(--pmbrown);border:none;background:none}