.row * {
    box-sizing: border-box;
}

.row {
    display: -ms-flexbox;
    /* IE10 */
    display: flex;
    -ms-flex-wrap: wrap;
    /* IE10 */
    flex-wrap: wrap;
    padding: 0 4px;
}

.column {
    -ms-flex: 25%;
    /* IE10 */
    flex: 25%;
    max-width: 25%;
    padding: 0 4px;
}

.column > img, .column > iframe {
    margin-top: 8px;
    vertical-align: middle;
    width: 100%;
}

.column img:hover,
.column a:focus img {
    box-shadow: 0px 0px 5px 5px #ff111199;
}

@media screen and (max-width: 1366px) {
    .column {
        -ms-flex: 50%;
        flex: 50%;
        max-width: 50%;
    }
}

@media screen and (max-width: 800px) {
    .column {
        -ms-flex: 100%;
        flex: 100%;
        max-width: 100%;
    }
}