.aside:before{
    content: '';
    background: url("../../img/zh/free.png") no-repeat;
    width: 215px;
    height: 160px;
    display: block;
    position: absolute;
    top: -69px;
    left: 5px;
    display: none;
}



@media only screen and (max-width: 800px){
    .aside:before {
        content: '';
        background: url("../../img/zh/free.png") no-repeat;
        background-size: contain;
        width: 130px;
        height: 120px;
        display: block;
        position: absolute;
        top: -50px;
        left: -60px;
    }
}
@media only screen and (max-width: 550px) {

    .aside:before {
        content: '';
        background: url("../../img/zh/free.png") no-repeat;
        background-size: contain;
        width: 120px;
        height: 160px;
        display: block;
        position: absolute;
        top: -53px;
        left: 50%;
        transform: translate(-50%, 0);
        -webkit-transform: translate(-50%, 0);
        -moz-transform: translate(-50%, 0);

    }
}

@media screen and (max-width: 460px) {
    .content-box:before {
        display: none;
    }
}