.leftNav {
    position: fixed;
    left: 0;
    top: 50%;
    transform: translate(0%, -50%);
    -moz-transform: translate(0%, -50%);
    -ms-transform: translate(0%, -50%);
    -o-transform: translate(0%, -50%);
    -webkit-transform: translate(0%, -50%);
    padding: 20px 0 0 0;
    width: 100px;
    background: #4a4a4a;
    font-size: 12px;
    line-height: 1;
    color: #fff;
    z-index: 100;
}
.leftNav li {
    display: block;
    width: 100%;
    margin: 0 0 30px 0;
    cursor: pointer;
    color: rgba(255, 255, 255, 0.5);
}
.leftNav li span {
    float: left;
    margin: 0px 8px 0 10px;
    width: 10px;
    height: 10px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    box-sizing: border-box;
}
.leftNav li:last-child {
    margin-bottom: 20px;
}
.leftNav .selectLeft {
    color: #ffffff;
}
.leftNav .selectLeft span {
    background: #fff;
}
@media screen and (max-width: 1335px) {
    /*蹇嵎瀵艰埅*/
    .leftNav {
        position: fixed;
        left: 0;
        top: 50%;
        transform: translate(0%, -50%);
        -moz-transform: translate(0%, -50%);
        -ms-transform: translate(0%, -50%);
        -o-transform: translate(0%, -50%);
        -webkit-transform: translate(0%, -50%);
        padding: 20px 0 0 0;
        width: 85px;
        background: #4a4a4a;
        font-size: 12px;
        line-height: 1;
        color: #fff;
        z-index: 100;
    }
    .leftNav li {
        display: block;
        width: 100%;
        margin: 0 0 30px 0;
        cursor: pointer;
        color: rgba(255, 255, 255, 0.5);
    }
    .leftNav li span {
        float: left;
        margin: 3px 3px 0 3px;
        width: 6px;
        height: 6px;
        border: 1px solid rgba(255, 255, 255, 0.5);
        border-radius: 50%;
        box-sizing: border-box;
    }
    .leftNav li:last-child {
        margin-bottom: 20px;
    }
    .leftNav .selectLeft {
        color: #ffffff;
    }
    .leftNav .selectLeft span {
        background: #fff;
    }
}
@media only screen and (max-width: 600px) {
    #leftNav {
        display: none;
    }
}