Is it possible to specify CSS code that will only affect a single, specific page break?

I am building one of my forms, and I added CSS code to center the Back and Next buttons. The problem arises as I want to center the custom text on  #form-pagebreak-next_80 , which would be different from the centering on all other pagebreaks. 

The CSS code I used for normal centering is:

.form-pagebreak 
{
    width: 22%;
    margin-left: auto;
    margin-right: auto;
}

Note: I found that 22% is the ideal amount for centering a standard Back and Next button combination, based on the standard form width. 

I tried to use the following CSS code to change the specific formatting of the one pagebreak, but it doesn't seem to work:

.form-pagebreak-back_80
{
    width: 100%;
    margin-left: auto;
    margin-right: auto;
}

.form-pagebreak-next_80 
{
    width: 100%;
    margin-left: auto;
    margin-right: auto;
}

Any suggestions? And as always, thank you for the excellent help you provide.

George (gen81465)

Use this :

#cid_80 .form-pagebreak {

    width: 100%;

}

#cid_80 .form-pagebreak-next-container {

    width: 100%;

    text-align: center;

}

#cid_80 .form-pagebreak-back-container {

    display: none;

}

Result:

Thanks for the help. That solution only works if I don't include the CSS code needed to center all the other (standard) page breaks. I need to be able to include the following CSS code for all of the rest of the page breaks:
.form-pagebreak {    width: 22%;    margin-left: auto;    margin-right: auto;}
Originally, the first page break was ok, as long as I didn't try to center any of them.
George (gen81465)
On Saturday, July 21, 2018, 8:41:40 PM EDT, JotForm wrote:

A new response has been received: Answered by EltonCris

Use this :
#cid_80 .form-pagebreak {
    width: 100%;
}
#cid_80 .form-pagebreak-next-container {
    width: 100%;
    text-align: center;
}
#cid_80 .form-pagebreak-back-container {
    display: none;
}
Result:
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...

Oops. My mistake. I didn't check out the preview of the form. It is only displaying incorrectly on the build page, which is fine with me.
George (gen81465)
On Saturday, July 21, 2018, 8:41:40 PM EDT, JotForm wrote:

A new response has been received: Answered by EltonCris

Use this :
#cid_80 .form-pagebreak {
    width: 100%;
}
#cid_80 .form-pagebreak-next-container {
    width: 100%;
    text-align: center;
}
#cid_80 .form-pagebreak-back-container {
    display: none;
}
Result:
View this thread on browser » Unsubscribe Thread 1532220099
...

As per your last reply it seems like my colleague's code worked. 

If you need further assistance, let us know. 

Thanks.