.slider {
  width: 100%;
  margin: 50px auto;
}
.slider > div {
  display: block;
}

.slick-prev:before,
.slick-next:before {
  color: black;
  background-color: #ffc90e;
  border-radius: 50%;
  padding: 0.3em;
}

.slick-slide {
  transition: all ease-in-out 0.3s;
  opacity: 0.2;
  margin: 0px 20px;
  border: solid 3px #ffc90e;
}

.slick-active {
  opacity: 0.5;
}

.slick-current {
  opacity: 1;
}