To use a theme, just include its css file (located in the dist/css/plugins/tooltipster/sideTip/themes folder) in your page and specify its name in Tooltipster's options: $('.tooltip').tooltipster({ theme: 'tooltipster-noir' }); To bring your own modifications to the style of your tooltips, a custom themes section awaits you below. Note: "sideTip" is the name of the plugin used by default by Toolti