html,
body {
    position: relative;
    height: 100%;
}

body {
    font-family: Helvetica Neue, Helvetica, Arial, sans-serif;
    font-size: 14px;
    color: #000;
    margin: 0;
    padding: 0;
}

.swiper-container {
    width: 100%;
    height: 100%;
}

.swiper-slide {
    background-position: center;
    background-size: cover;
}

.swiper-button-prev:after, .swiper-button-next:after {
    content: '';
}

.swiper-button-prev, .swiper-button-next {
    background-color: #333;
    padding-right: 11px;
    height: 39px;
    text-align: center;
    display: none;
}

.swiper-button-prev {
    background-image: url(../image/jiantou.png);
    background-repeat: no-repeat;
    background-position: -2 0;
    opacity: 0.5;
}

.swiper-button-next {
    background-image: url(../image/jiantou.png);
    background-repeat: no-repeat;
    background-position: -41px 0;
    opacity: 0.5;
}

    .swiper-button-prev:hover, .swiper-button-next:hover {
        opacity: 1;
    }

.banner:hover .swiper-button-prev, .banner:hover .swiper-button-next {
    display: block;
}