

main {
    position: relative;
    /*top: 20vh;*/
    /*height: 750px;*/
    height: auto;
    width: 100%;
    overflow: hidden;
    position: relative;
    z-index: 2;
}

main .bg {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background-image: url(../image/banner1.jpg);
    background-size: 100% 100%;
    filter: blur(30px);
}

main section {
    position: relative;
    left: 50%;
    transform: translateX(-50%);
    /*height: 100%;*/
    height: auto;
    width: 100%;
    /*max-width: 980px;*/

}

main section .tupian {
    width: 100%;
    /*height: 100%;*/
    height: auto;
}

main section .tupian .image {
    width: 100%;
    /*height: 100%;*/
    height: 100%;
    object-fit: cover;


}

.yun {
    animation: bian 5s linear infinite;
}


@keyframes bian {

    0%,
    100% {
        opacity: 0.2;
        backdrop-filter: blur(10px);
    }

    30%,
    80% {
        opacity: 1;
        backdrop-filter: blur(0px);
    }

}

main .select {
    position: absolute;
    bottom: 10px;
    height: 30px;
    width: 100%;
    display: flex;

    justify-content: center;
    align-items: center;
}

main .select .dian {
    margin: 3px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 2px solid rgb(255, 254, 254);

}

main .select .dian:hover {
    background-color: rgb(255, 254, 254);
    cursor: pointer;
}

.check {

    background-color: rgb(255, 254, 254);
}

main section .bt {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background-color: rgba(82, 81, 81, 0.2);
    border-radius: 20%;
    cursor: pointer;
    transition: all 0.3s;
}

main section .bt:hover {
    box-shadow: inset 0 0 1px rgba(255, 255, 255, .8),
    inset 0 0 5px rgba(255, 255, 255, .8),
    inset 0 0 15px rgba(255, 255, 255, .8);
}

main section .left {
    left: 0;
}
.left>span{
    color: white;
    font-size: 48px;
}
main section .right {
    right: 0;
}
.right>span{
    color: white;
    font-size: 48px;
}

/*当屏幕尺寸小于1100px时，应用下面的CSS样式,详细用法网址：https://www.xuewangzhan.net/baike/css3-379.html*/
@media screen and (max-width: 1100px) {
    main section .left {
        left: 20px;
    }

    main section .right {
        right: 20px;
    }
}
main section .anniu {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 25px;
    color: rgb(255, 255, 255);
    user-select: none;
    transition: all 0.3s;
}