*,:after,:before{box-sizing:border-box}body{font-family:Arial,sans-serif;margin:0}body,html{background-color:#fafbf4;color:#1f2937;overflow-x:hidden}.header{background:#fff;display:flex;justify-content:space-between;padding:20px;position:sticky;top:0}.hero{background:#f5f5f5;padding:100px 20px;text-align:center}.btn{background:#4caf50;border:none;color:#fff;padding:10px 20px}.grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}@media (max-width:768px){.hero button{max-width:100%;text-align:center;width:100%}}