@media screen and (min-width: 1440px) {
    * {
        padding: 0px;
        margin: 0px;
    }

    .all {
        margin: 0 auto;
        width: 1000px;
        height: 800px;
    }

    .small {
        width: 400px;
        height: 680px;
        position: relative;
    }

    .small img {
        /*border:1px solid gray ;*/
        width: 400px;
        height: 680px;
    }

    .shadow {
        width: 100px;
        height: 100px;
        background-color: black;
        opacity: .2;
        position: absolute;
        top: 0px;
        left: 0px;
        display: none;
        cursor: move;
    }

    .cover {
        width: 400px;
        height: 680px;
        z-index: 10;
        position: absolute;
        left: 0px;
        top: 0px;
        cursor: move;
    }

    .big {
        width: 400px;
        height: 680px;
        position: relative;
        overflow: hidden;
        display: none;
        float: right;

    }

    .big img {
        width: 800px;
        height: 1360px;
        position: absolute;
        top: 0px;
        left: 0px;
    }
}

@media screen and (max-width: 1440px) {
    * {
        padding: 0px;
        margin: 0px;
    }

    .all {
        margin: 0 auto;
        width: 80%;
        height: 800px;
    }

    .small {
        width: 100%;
        height: 680px;
        position: relative;
    }

    .small img {
        /*border:1px solid gray ;*/
        width: 400px;
        height: 680px;
    }

    .shadow {
        width: 100px;
        height: 100px;
        background-color: black;
        opacity: .2;
        position: absolute;
        top: 0px;
        left: 0px;
        display: none;
        cursor: move;
    }

    .cover {
        width: 400px;
        height: 680px;
        z-index: 10;
        position: absolute;
        left: 0px;
        top: 0px;
        cursor: move;
    }

    .big {
        width: 400px;
        height: 680px;
        position: relative;
        overflow: hidden;
        display: none;
        float: right;

    }

    .big img {
        width: 800px;
        height: 1360px;
        position: absolute;
        top: 0px;
        left: 0px;
    }

}