#diagram {
    height: 10em;
    /*width: 20em;*/
}

#diagram div {
    display: inline-block;
    background-color: black;
    height: 100%;
    width: 2em;
    margin-left: 1em;
}

#diagramTekst * {
    display: inline-block;
    width: 2em;
    margin-left: 1em;
    transform: rotateZ(90deg);
}