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There is a possibility to make changes in the look and feel of a popup.

For this you need to take the following steps:

  • add a new CSS class(es) with desired settings in the <style> section of your HTML page or in your file with styles (don't forget to include your file on the page in this case)
.my-first-class {
/*some styles*/

.my-second-class {
/*some styles*/
  • specify the name of the created CSS class (or names of classes separated by spaces) as the value of the css property in the Popup configuration:
const popup = new dhx.Popup({ 
css:"my-first-class my-second-class"

Related sample: Popup. Styling (custom CSS)