.widget-custom-flex3 {
    display: flex;
    flex-wrap: wrap;
}

.widget-custom-flex3-item {
    width: 25%;
    padding: 3px;
}


.widget-custom-flex3-item img {
    width: 100%;
    height: 100px;
}


@media only screen and (max-width: 900px) {
    .widget-custom-flex3 {
        display: flex;
        flex-wrap: wrap;
    }

    .widget-custom-flex3-item {
        width: 50%;
    }


}