You can customize the quit icon by following these steps:
Access the Themes section
Click on the CSS tab
If you want to change its size, please change the viewport (width/height) for these two CSS rules (in the example below, we changed them to 15 pixels):
* Preview quit/x button outer container styles */
#userguiding .ug-preview-quit-button
{
width: 15px;
height: 15px;
justify-content: flex-end;
align-items: flex-start;
}
/* Preview quit/x button svg container styles */
#userguiding .ug-preview-quit-button svg
{
background-color: transparent;
width: 15px;
height: 15px;
}
Apart from size, If you want to style the outer container and SVG separately, apply your CSS properties individually.