Hello,
I´ve tried to change bottom value to 700 or 600 and with 600 is up where I want .. but only on the PC screen, then if you shrink it to another configuration screen like tablet or some smartphones, it does not appear or remains running, which I think your control needs is an option in addition to selecting the left, or right, location that would have Top or Bottom to always take as reference the upper limit of the screen, the fixed values from below .. it is not elegant, and it is not responsive, some chance to add something like that .. or am I the only crazy person who wants the whatsapp button up?
Best Regards,