body {
    margin: 0px;
    font-family: Gill Sans, sans-serif;
    width: 100%;
    height: 100%;
    font-weight: bold;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none
}

.rectangle {
    position: absolute;
}

/* master flexbox (column) */
#rectangles {
    display: flex;
    flex-direction: column;
    z-index: 1;
    /* height is set using JS to size container based on window */
}

/* title bar within flex container */
#title {
    display: flex;
    align-items: center;
    height: 70px;
    background-color: darkslategrey;
    color: white;
    font-size: 1.5rem;
}

#title p {
    margin-left: 20px;
}

/* content row within flex container */
.row {
    display: flex;
}

.column {
    flex: 50%;
    padding: 20px;
}

.column:nth-child(1) {
    background-color: lightgray;
}

.column:nth-child(2) {
    background-color: gray
}

/* remaining void space witihn flex container */
#clickArea {
    background-color: white;
    flex: 1;
}