h1 span {
    font-size: 3rem;
}
.testimonial_slider .cntop {
    margin-block: 0 90px;
}
.testimonial_slider .cntop p {
    text-align: center;
}
.testimonial_slider h2 {
    margin-block: 0;
}
@media (max-width: 768px) {
    h1 span {
        font-size: 1.3rem;
    }
}