Centering Promotional Pop Up Header Text

Hey guys trying to center the header text "sign up for emails" on mobile and I had this:

@media screen and (max-width:767px) {
.sqs-slice-body-content * {
    text-align: center !important;
}
  }

But that is not working.

Any help please?

4 hours ago, mikemobley said:

Hey guys trying to center the header text "sign up for emails" on mobile and I had this:

 

@media screen and (max-width:767px) {
.sqs-slice-body-content * {
    text-align: center !important;
}
  }

But that is not working.

Any help please?

Can you share your site with protected password so I can take a look?