Hello @arnab28
Yes, you can use multiple calculators in the same website, even in the same page.
I don’t know exactly the way you are doing to customize the styles, so, I’ll try to describe the worst case: the insertion of the same form multiple times in the same page, and modify their appearnce by instance of the form.
If you want to assign a class name to a form, you should simply to pass a “class” attribute through its shortcode. So, I’ll try to describe the process with a hypothetical example:
* Assuming you want to insert the same form (the form with id=1) twice in the page, and you want set the colors of labels in red, in the first form, and set to green the labels of the second form.
In this hypothetical example you can insert the shortcodes as follows (you can use the class names you want):
[CP_CALCULATED_FIELDS id="1" class="red"]
[CP_CALCULATED_FIELDS id="1" class="green"]
and now the styles can be defined as follows:
.red #fbuilder label{color:red !important;}
.green #fbuilder label{color:green !important;}
Best regards.