1. Go to Theme Options - Custom, and add this to Custom Content in Footer:

<div class="mobile-sticky-bar">
	<a href="#" class="cta-btn">Get Started</a>
</div>

1. Add this to Custom CSS:

/* Sticky bottom bar (visible only on mobile) */
.mobile-sticky-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #ffffff;
    padding: 12px 20px;
    display: none; /* Hidden by default */
    box-shadow: 0 -2px 10px rgba(0,0,0,0.08);
    z-index: 9999;
}

/* CTA button */
.mobile-sticky-bar .cta-btn {
    display: block;
    width: 100%;
    background: #000;      /* Change color if needed */
    color: #fff;
    text-align: center;
    padding: 14px 18px;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
}

/* Mobile only */
@media (max-width: 768px) {
    .mobile-sticky-bar {
        display: block;
    }
}

1. Add your link to the HTML, and further customize the bar using CSS.