Right Side Section of Footer Bottom Box is not visible on mobile devices

To pull copyright menu into center use this CSS in your wp-admin >> Appearance >> Customize >> Additional CSS

@media screen and (max-width: 39.9375em) {
.footerbottom .hide-for-small-only {
   display:block !important;
}
.footerbottom .hide-for-small-only .pull-right {
   text-align:center;
    float:none !important;
}
.footerbottom .hide-for-small-only .pull-right  .footerbottom ul {
    text-align: center;
    width: auto;
    display: inline-block;
}
}