Elementor - Setup trigger for Popup
Elementor is a popular page builder plugin for WordPress, which makes it easier to build beautiful pages.
To trigger a pop-up in HollerBox with Elementor take the following steps:
Drag a Button element to your Post/Page
Click the Advanced button in the top right and add a custom class without the dot(e.g.: My-class) and PUBLISH.
Give your Elementor button a CSS Class, and then use the On Click trigger in HollerBox and add the CSS selector.
Next, complete the steps in the Create your first Popup article. Under Triggers, activate the On Click using the slider.
In the Clicked element field enter the custom class you added in Elementor