If you want to show your content center align on mobile devices for some specific section then you can do this very easily via CSS.
add a custom CSS class of ts-center-text-mobile in Text Module settings
and use this bit of CSS in Divi > Theme Options > General > Custom CSS section
/* Text align center in mobile view only */
@media (max-width:980px) {
.ts-center-text-mobile .et_pb_text_inner,
.ts-center-text-mobile .heading,
.ts-center-text-mobile .et_pb_button_module_wrapper {
text-align: center!important;
}
}
If you want to do this for entire website then no need to add any custom css class, just enter the following code :
/* Text align center in mobile view only */
@media (max-width:980px) {
.et_pb_text_inner,
.heading,
.et_pb_button_module_wrapper
{
text-align: center!important;
}
}