test-slider-fullwidth.css

body {
  font-family: "Open Sans", sans-serif;
}
.container{
  padding-top: 20px;
  padding-bottom: 30px;
}

.testimonials {
  overflow: hidden;
  position: relative;
  max-height: 300px;
}

.testimonials {
  background: #faf4ff;
}

.one-slide,
.testimonial,
.message {
  border: none !important;
  outline: none !important;
  color: black;
}

.icon-overlay {
  position: absolute;
  opacity: 0.3;
  right: 10%;
  top: 0;
  height: 325px;
  width: 100%;
  max-width: 400px;
}

.carousel-controls .control {
  position: absolute;
  transform: translateY(-50%);
  width: 45px;
  height: 45px;
  border-radius: 50%;
  border: 2px solid black;
  z-index: 1;
}

.prev {
  left: -2.25rem;
}

.next {
  right: -2.25rem;
}

@media screen and (max-width: 768px) {
  .testimonials {
    max-height: 700px;
  }
  .icon-overlay {
    height: 300px;
    top: calc(50% - 150px);
  }
  .carousel-controls .control {
    width: 25px;
    height: 25px;
    top: inherit;
  }
  .prev {
    left: 0;
  }
  .next {
    right: 0;
  }
  .control i {
    font-size: .7rem;
  }
  .testimonials .message {
    font-size: 1rem;
  }
  .testimonials h2 {
    font-size: 1.5rem;
  }
}