div#slidermaster{
width:100%;
height: auto !important;
background-color:#000000;
}

#slider{
margin: 0 auto 0 auto;
width: 100%;
background-color:#000000;
}

#slider div img{
height: auto;
margin: 0 auto;
max-width:1280px;
width:90%;
}

/*slick setting*/
.slick-prev:before,
.slick-next:before{
color: #000;
}



#slider > div { /*class="slider"の子要素divを指定*/
background: #ffffff; /*背景色*/
}