#lightgallery2 {
    position: relative;
}

#prevThumb {
    position: absolute;
    left: 0;
    top: 50%;
    color: transparent;
    background: url(../../img/left-arrow.png) rgba(255,255,255,0.3) center center no-repeat;
    height: 74px;
    width: 74px;
    z-index: 9999;
    padding: 3px;
}

#nextThumb {
    position: absolute;
    right:0;
    top:50%;
    color:transparent;
    background:url(../../img/right-arrow.png) rgba(255,255,255,0.3) center center no-repeat;
    height: 74px;
    width: 74px;
    z-index: 9999;
}

@media (max-width: 700px) {
  #prevThumb {
    background-size:20px;
    height: 35px;
    width: 28px;
  }
    #nextThumb {
    background-size:20px;
    height: 35px;
    width: 28px;
  }
}