.slider{
  margin-top: 50px;
  margin-bottom: 100px;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}
.slider img{
  height: auto;
  width: 100%;
}
/*slick setting*/
.slick-prev:before,
.slick-next:before {
  color: #000;
}