*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}


.bg_img{
    width: 100%;
    display: block;
}


.bg_img img{
    width: 100%;
    height: auto;
}

.bg_img_mobile{
    width: 100%;
    display: none;
}



@media (max-width: 800px) {

    .bg_img{
        width: 100%;
        display: none;
    }

    .bg_img_mobile{
        width: 100%;
        display: block;
    }
    
    
    .bg_img_mobile img{
        width: 100%;
        height: auto;
    }

}