* {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    box-sizing: border-box;
}

.column {
    float: left;
    width: 25%;
    padding: 0 50px;
}

.row {
    margin: 0 -5px;
}

.row:after {
    content: '';
    display: table;
}

@media screen and (max-width: 600px) {
    .column {
        width: 100%;
        display: block;
        clear: both;
    }
}

.card {
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
    padding: 16px;
    text-align: center;
    background-color: #444;
    color: #fff;
    margin-bottom: 10px;
}