* {
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
}

.three-column {
    padding: 1em;
    -webkit-column-count: 3;
       -moz-column-count: 3;
            column-count: 3;
    -webkit-column-gap: 1em;
       -moz-column-gap: 1em;
            column-gap: 1em;
}