.centerThumb .slick-current img{
  border:2px solid rgba(0,0,0,1);
}
.slick-prev:before, .slick-next:before{
  color:#2b2b2b
}
.slick-next{
  right:15px
}
.slick-prev{
  left:15px;
  z-index: 1;
}