#part1 {
    display: flex;
    flex-direction: row;
}

#displacement-explanation {
    flex-basis: 0;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

#pressure-explanation {
    flex-basis: 0;
    flex-grow: 1;
}

#container {
    position: relative;
}

#diagram {
    display:block;
    width: 100%;
    height:25em;
}

canvas {
    position: absolute;
    z-index: -1;
    top: 0;
    right: 0;
    left: 0;
    /* display:block;
    width: 100%;
    height:25em; */
}