Floating buttons : How to display 2 modules ?

I created 2 modules, with 2 different module classes jfab1 and jfab2, and the same position debug.
The modules are published on every pages.
They are one above the other, I do not know how to separate them.

In css styles, I tried to set positions like that :

.jfab_wrapper {
  bottom: 50%!important;
}
.jfab1_main_btn {
    margin-top: -70px !important;
}
.jfab2_main_btn {
    margin-top: 70px !important;
}

Or like that

.jfab_wrapper .jfab1_main_btn {
   bottom: 50% !important;
  }
.jfab_wrapper .jfab2_main_btn {
   bottom: 40% !important;
  }
And so many others tests

The buttons are there, but at the same position, one above the other.

Thanks a lot

OK the module with class jfab2 is on position right, the module with class jfab1 is on debug.

OK I will keep one button with all links for now,
thank you for your assistance and thank you for this great tool !