H headlines are Uppercase on Mobile View only

How can I get the mobile view to had upper/lower case, instead of all uppercase?

I tried CSS and it still didn’t work. Worked for desktop, but not mobile view.

CSS added:
h1, h2, h3, h4, h5, h6 {
text-transform: none !important;
}

@media only screen and (max-width: 767px) {
h1, h2, h3, h4, h5, h6 {
text-transform: none !important;
}
}