.nav-btn { background: #000000; color: #ffffff; border-radius: 20px; padding: 10px 24px; display: inline-block; transition: background 0.3s ease, color 0.3s ease, box-shadow 0.3s ease; cursor: pointer; } .nav-btn.nav-active { background: #ffffff; color: #000000; box-shadow: 0 0 0 2px #000000 inset; }