Hi Chi-K,
I have checked the CSS in the custom.css file and see that you missing the "}". in this code:
@media(max-width: 575.98px) {
.t4-section .t4-section-inner.mobile-space {
padding-top: 40px;
}
.t4-section .t4-section-inner.mobile-space {
padding-bottom: 40px;
}
}
Also, to change the padding for the Testimonials module, you can use the following CSS code:
@media(max-width: 575.98px) {
.acm-testimonial.style-1.mobile-space {
padding: 40px 0;
}
}