.column {
    float: left;
    width: 33.33%;
    display: none;
}

.row:after {
    content: "";
    display: table;
    clear: both;
}

.content {
    background-color: #343A40;
    padding: 10px;
    color: white;
}

.show {
    display: block;
}

.btn:hover {
    background-color: #ddd;
}

.btn.act {
    background-color: #006B96;
    color: white;
}


@media (max-width: 690px) {
    .column {
        width: 50%;
    }
}

@media (max-width: 470px) {
    .column {
        margin: auto;
        width: 80%;
    }

}