CSS ClassNameYou can customize your product tour using the tooltipClass option:.customTooltip * { color: #4a4a4a; font-size: 18px} .customTooltip .introjs-tooltip-title { color: #0a41c9;}CopyLive EditorintroJs().setOptions({ tooltipClass: 'customTooltip' }).start()introJs().setOptions({ tooltipClass: 'customTooltip'}).start()ResultRunQuaco LighthouseThe Quaco Head Lighthouse is a well maintained lighthouse close to St. Martins. It is a short, beautiful walk to the lighthouse along the seashore.