How to customize color of the preloader

You can change the preloader in the Custom Product Builder in the "customproductbuilder.css" file.
The loader circle color:

#product-builder .cpb-loader-center svg .cpb-svg-stroke {
stroke: yourcolor; /* color in HEX or color name */
}

The loader text:

#product-builder .cpb-loader-text {
/* you can insert here your custom styles */
}

The loader version:

#product-builder .cpb-loader-version {
/* you can insert here your custom styles */
}