.firstContent{
    position: relative;
}
.firstpic{
    position: relative;
}
   .firstpic .item_pic img{
        object-fit: cover;
    width: 100%;
    height: 100%;
            }
/* 箭头 */
.firstContent .firstpic-prevBtn{
    position: absolute;
    top: 50%;
    background: rgba(0,0,0,0);
    border: none;
    outline: none;
    border-radius: 50%;
    width: 15px;
    height: 15px;
    left: 10px;
        cursor:pointer;
            transform: translateY(-50%);
}
.firstContent .firstpic-nextBtn{
    position: absolute;
    top: 50%;
    right: 0;
    background: rgba(0,0,0,0);
    border: none;
    outline: none;
    border-radius: 50%;
    width: 15px;
    height: 15px;
    right: 10px;
        cursor:pointer;
            transform: translateY(-50%);
}
.firstpic .container {
    display: none;
}
.fa-chevron-left:before,.fa-chevron-right:before{
    font-size: 25px;
    color: white;
}

/* 小点 */
.firstContent .slick-dots{
    position: absolute;
    bottom: 10px;
    display: none;
    width: 100%;
    padding: 0;
    list-style: none;
    text-align: center;
}
.firstContent .slick-dots .slick-active{
    background: rgba(255,255,255,1);
}
.firstContent .slick-dots button{
    display: none;
}
.firstContent .slick-dots li{
    border-radius: 50%;
    background-color: rgba(0,0,0,.5);
    position: relative;
    display: inline-block;
    width: 15px;
    height: 15px;
    margin: 5px;
    padding: 0;
    cursor: pointer;
}
.firstContent .item_pic{
        height: 550px;
        display:block;
}
.firstContent .slick-prev{
    left: 0;
}
.firstContent .slick-next{
    right: 0;
}
.firstContent .slick-slider{
    padding-bottom: 0;
}
@media screen and (min-width:2559px){
    .fa-chevron-left:before,.fa-chevron-right:before{
        font-size: 25px;
    }
}
@media screen and (max-width:750px){
    .firstContent .slick-dots li{
        width: 10px;
        height: 10px;
    }
    .fa-chevron-left:before,.fa-chevron-right:before{
        font-size: 10px;
    }
}