html, body {
    margin: 0;
    padding: 0;
}

* {
    box-sizing: border-box;
}

.slider {
    width: 100%;
    margin: 0px auto;
}

.slick-slide {
    margin: 0px 40px;
}

.slick-slide img {
    width: 100%;
}

.slick-prev:before,
.slick-next:before {
    color: gray;
}