.slider {
    width: 80%;
    margin: 0 auto;
  }
  
  .slider-item img {
    width: 50%;
  }
  
  .slick-prev,
  .slick-next {
    font-size: 0;
    line-height: 0;
    position: absolute;
    top: 50%;
    display: block;
    width: 40px;
    height: 40px;
    padding: 0;
    -webkit-transform: translate(0, -50%);
    -ms-transform: translate(0, -50%);
    transform: translate(0, -50%);
    cursor: pointer;
    color: transparent;
    border: none;
    outline: none;
    background: none;
  }
  
  .slick-prev:before,
  .slick-next:before {
    font-size: 40px;
    line-height: 1;
    color: #999;
  }
  
  .slick-prev {
    left: 0;
  }
  
  .slick-next {
    right: 0;
  }