a.roll-button.button-slider {
  display: none;
}
or
a.roll-button.button-slider {
  display: none!important;
}
@media only screen and (max-width: 900px){
  #slideshow{
    height: 400px !important;
  }
}

@media only screen and (max-width: 600px){
  #slideshow{
    height: 210px !important;
  }

  .text-slider-section{
    top: 40%;
  }
  
}

#slideshow .slides-container .slide-item{
  background-position: top center;
  background-size: 100%;
}

.site-info.container {
    display: none;
}