How to adapt the text of the call to action?

What code do I need so that when the page is viewed on cell phone the call to action button phrase is seen

The font size of this CTA button is a bit big when viewing on mobile layout, you can reduce this font size by this custom css code:

@media (max-width: 576px) {
.jub-block.cta-1 a.btn, .jub-block.cta-1 a.btn-md {
    font-size: 10px;
}
}