.tabs { display: flex; margin: 0; }
.tab-button { padding: 8px 16px; cursor: pointer; margin-right: 2px; border: none; }
.tab-button.active { border: 2px solid #000; }
.content-panel { display: none; }
.content-panel.active { display: block; }

@media (max-width: 599px) {
  .tabs {position: fixed; bottom: 0; left: 0; right: 0; z-index: 99; }
}