.material-calculator{max-width:500px;margin:0 auto}.material-calculator h3{font-size:32px;margin-bottom:0.25em}.material-calculator p{margin-bottom:1em}.material-calculator label{display:block;font-weight:600;margin-bottom:4px}.material-calculator input[type="number"],.material-calculator input[type="text"]{width:100%;padding:0.75em;border:1px solid #ccc;border-radius:4px;margin-bottom:12px;font-size:16px}#top-menu li:last-child a{display:flex;align-items:center;gap:8px}#top-menu li:last-child a::before{content:"";display:inline-block;width:18px;height:18px;background-image:url("https://upload.wikimedia.org/wikipedia/commons/thumb/b/b8/2021_Facebook_icon.svg/960px-2021_Facebook_icon.svg.png");background-size:contain;background-repeat:no-repeat}