Visible Mobile ONLY

Hey guys, so the following style use to work for me.
Now the class .visible-phone does not.
It just has everything disappearing on the mobile device.

The goal I am after is to have certain cells showing content on the mobile phone only/ Any thoughts are appreciated …

.hidden {
display: none;
visibility: hidden;
}

.visible-phone {
display: none !important;
}

.visible-tablet {
display: none !important;
}

.hidden-desktop {
display: none !important;
}

@media (max-width: 767px) {
.visible-phone {
display: inherit !important;
}
.hidden-phone {
display: none !important;
}
.hidden-desktop {
display: inherit !important;
}
.visible-desktop {
display: none !important;
}
}

@media (min-width: 768px) and (max-width: 979px) {
.visible-tablet {
display: inherit !important;
}
.hidden-tablet {
display: none !important;
}
.hidden-desktop {
display: inherit !important;
}
.visible-desktop {
display: none !important ;
}
}