#main_banner br.mobile {
    display: none;
}

@media (max-width: 767px) {
    #main_banner br.mobile {
        display: block;
    }
}

.bm_bn_ca ul {
    display: block;
}

.bm_bn_ca ul::after {
    content: '';
    display: block;
    clear: both;
}

.bm_bn_ca ul li {
    float: left;
    width: calc((100% - 24px) / 4);
    margin-left: 6px;
    margin-bottom: 6px;
}

/* .bm_bn_ca ul li:nth-child(3n+1) {
    margin-left: 0;
} */

.bm_bn_ca ul li img {
    width: 100%;
}

@media (max-width:767px) {
    .bm_bn_ca ul li {
        width: calc((100% - 6px) / 3);
        margin-left: 3px;
        margin-bottom: 3px;
    }
}

@media (max-width:575px) {
    .bm_bn_ca ul li {
        width: calc((100% - 3px) / 2);
        margin-left: 0;
        text-align: center;
    }

    .bm_bn_ca ul li:nth-child(odd) {
        margin-left: 0;
    }

    .bm_bn_ca ul li:nth-child(even) {
        margin-left: 3px;
    }
}