#contentwrap {
    width: 100%;
}

.br_box {
    width: 100%;
    height: 78px;
    display: none;
}
.main_banner {
    background: url(../img/m_3_banner.jpg) center no-repeat;
    width: 100%;
    height: 500px;
    background-size: cover;
}

.title {
    width: 100%;
    height: 80px;
    background-color: #000000;
    
    color: #fff;
    text-align: center;
    font: 21px/75px '';
        margin: 0;
        padding: 0;
}

.content_box {
    max-width: 1024px;
    margin: 0 auto;
}

.main_img {
    max-width: 100%;
    height: 400px;
    background: url(../img/accessries/stand.jpg) center no-repeat;
    background-size: cover;
    margin: 0 auto;
    border: 1px solid #ddd;
    box-sizing: border-box;
}
.img_1 {
    
    background: url(../img/accessries/stand.jpg) center no-repeat;
    background-size: cover;
    
}

.img_2 {
    
    background: url(../img/accessries/stand_hover.jpg) center no-repeat;
    background-size: cover;
    
}

.img_3 {
    
    background: url(../img/accessries/stand_2.JPG) center no-repeat;
    background-size: cover;
    
}

.img_4 {
    
    background: url(../img/accessries/stand_3.JPG) center no-repeat;
    background-size: cover;
    
}



/**********************************/


@media all and (max-width:1023px) {
    .main_banner {
    background: url(../img/m_3_banner.jpg) center no-repeat;
    width: 100%;
    height: 300px;
    background-size: cover;
    }
}

@media all and (max-width:767px) {
    
    .br_box {
    width: 100%;
    height: 78px;
    display: block;
    }

}

@media all and (max-width:414px) {

    
}