* {
    box-sizing: border-box;
}

/* Create two equal columns that floats next to each other */
.column {
    background-color:#000;
    color: white;
    float: left;
    width: 50%;
    padding: 10px;
    height: auto; /* Should be removed. Only for demonstration */
}

/* Clear floats after the columns */
.row:after {
    content: "";
    display: table;
    clear: both;
}

/* Responsive layout - makes the two columns stack on top of each other instead of next to each other */
@media screen and (max-width: 600px) {
    .column {
        width: 100%;
        padding-bottom: 0;
        padding-top: 0;
    }
}