html{box-sizing:border-box}*,*:before,*:after{box-sizing:inherit}.container{max-width:1100px;margin:0 auto;padding:1rem}.header{background:#111827;color:#fff;padding:1rem 0}.footer{background:#0f172a;color:#cbd5e1;padding:1rem 0;margin-top:2rem}.btn{display:inline-block;padding:.5rem 1rem;border-radius:.5rem;background:#111827;color:#fff;text-decoration:none}.card{background:#fff;padding:1rem;border-radius:.5rem;box-shadow:0 6px 18px rgba(2,6,23,.08)}